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Friday, July 11, 2025
Techcratic
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  • AI
    Artificial Intelligence

    Enabling Differentially Private Federated Learning for Speech Recognition: Benchmarks, Adaptive Optimizers, and Gradient Clipping

    Artificial Intelligence

    Overcoming Vocabulary Constraints with Pixel-level Fallback

    Artificial Intelligence

    Uphold ethical standards in fashion using multimodal toxicity detection with Amazon Bedrock Guardrails

    Artificial Intelligence

    10 Surprising Things You Can Do with Python’s datetime Module

    Artificial Intelligence

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    Scale generative AI use cases, Part 1: Multi-tenant hub and spoke architecture using AWS Transit Gateway

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    Artificial Intelligence

    Transforming network operations with AI: How Swisscom built a network assistant using Amazon Bedrock

  • Apple
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    M4 MacBook Air, iPhone, AirPods, iPad, more 9to5Mac

    Leaker teases Dynamic Island’s ‘significant evolution’ ahead

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    July 11, 2025 – Apple’s plans for new Macs, iPads, and more

    Apple Watch Ultra 3: Three new features are coming next year

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    Report: Apple set to land US F1 streaming rights in $150 million+ deal

    Fresh leak confirms new iPhone 17 and iPhone 17 Air colors

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    Apple reviving its discontinued AirPort router has never looked more likely

    Apple’s AirPort products are now ‘obsolete,’ with one exception

    Apple leaders join Sun Valley gathering of tech & media

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    Tim Cook thanks American heroes in Memorial Day post on X

    Gallery: Tim Cook and Eddy Cue attend Sun Valley ‘summer camp for billionaires’

  • ComputerWorld
    AI coding tools can slow down seasoned developers by 19%

    AI coding tools can slow down seasoned developers by 19%

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

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    A magically minimalist Android makeover – Computerworld

    A magically minimalist Android makeover – Computerworld

    From conversation to task completion – Computerworld

    From conversation to task completion – Computerworld

    OpenAI and Perplexity enter browser wars to take on Chrome – Computerworld

    OpenAI and Perplexity enter browser wars to take on Chrome – Computerworld

    Using OneDrive for Web – Computerworld

    Using OneDrive for Web – Computerworld

  • Gaming
    Zelda Breath of the Wild – 27 Ways to Make a Campfire

    Zelda Breath of the Wild – 27 Ways to Make a Campfire

    Ocarina of Time Walkthrough Let's Play – Part 3

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    Should Charles Martinet voice Mario in The Super Mario Bros. Movie?*

    Should Charles Martinet voice Mario in The Super Mario Bros. Movie?*

    Final Fantasy producer Yoshi-P says ‘there’s no clear-cut answer’ to whether Final Fantasy will return to turn-based RPGs, because the direction of the next Final Fantasy will be up to the directors of the next Final Fantasy

    Final Fantasy producer Yoshi-P says ‘there’s no clear-cut answer’ to whether Final Fantasy will return to turn-based RPGs, because the direction of the next Final Fantasy will be up to the directors of the next Final Fantasy

    Zelda Ocarina of Time 3D 100% Walkthrough – Part 72/78 – Gerudo Training Ground Part 1 (Commentary)

    Zelda Ocarina of Time 3D 100% Walkthrough – Part 72/78 – Gerudo Training Ground Part 1 (Commentary)

    Capcom celebrates the first anniversary of Kunitsu-Gami: Path of the Goddess by ripping out its Denuvo DRM

    Capcom celebrates the first anniversary of Kunitsu-Gami: Path of the Goddess by ripping out its Denuvo DRM

    The Legend of Zelda: Breath of the Wild – Daka Tuss Shrine Walkthrough

    The Legend of Zelda: Breath of the Wild – Daka Tuss Shrine Walkthrough

    30 MORE Things You STILL Didn't Know In Zelda Breath Of The Wild

    30 MORE Things You STILL Didn't Know In Zelda Breath Of The Wild

    Playdead’s classic minimalist platformers Limbo and Inside are being pulled from GOG next week, so grab ’em while you can

    Playdead’s classic minimalist platformers Limbo and Inside are being pulled from GOG next week, so grab ’em while you can

  • Retro Rewind
    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

  • Tech Art
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    Northern Lights Aurora Night Sky Vector Art Tutorial Affinity Designer V2

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    Artist Spotlight: Nina Molloy

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    Interactive Particle Systems from Gaussian Splats in TouchDesigner! (2025 + Mac Compatible)

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  • Tech Deals
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  • Techs Got To Eat
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    Cheesy Broccoli Rice Mug: 5-Minute Super Comfort Food

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    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

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    Bacon Fried Rice Mug: 5-Minute Microwave Meal

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    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

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    Loaded Bacon Cheesy Potato Mug: 5-Minute Comfort Food

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    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

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    Oreo Mug Cake: 2-Minute Cookie & Cake Combo!

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  • Tesla
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  • UFO
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    Roswell, NM Tourism | Funny Alien Extraterrestrial UFO Saucer Men Women T-Shirt

    Roswell, NM Tourism | Funny Alien Extraterrestrial UFO Saucer Men Women T-Shirt

  • AI
    Artificial Intelligence

    Enabling Differentially Private Federated Learning for Speech Recognition: Benchmarks, Adaptive Optimizers, and Gradient Clipping

    Artificial Intelligence

    Overcoming Vocabulary Constraints with Pixel-level Fallback

    Artificial Intelligence

    Uphold ethical standards in fashion using multimodal toxicity detection with Amazon Bedrock Guardrails

    Artificial Intelligence

    10 Surprising Things You Can Do with Python’s datetime Module

    Artificial Intelligence

    New capabilities in Amazon SageMaker AI continue to transform how organizations develop AI models

    Artificial Intelligence

    Unlock retail intelligence by transforming data into actionable insights using generative AI with Amazon Q Business

    Artificial Intelligence

    Scale generative AI use cases, Part 1: Multi-tenant hub and spoke architecture using AWS Transit Gateway

    Artificial Intelligence

    Build a just-in-time knowledge base with Amazon Bedrock

    Artificial Intelligence

    Transforming network operations with AI: How Swisscom built a network assistant using Amazon Bedrock

  • Apple
    M4 MacBook Air, iPhone, AirPods, iPad, more 9to5Mac

    M4 MacBook Air, iPhone, AirPods, iPad, more 9to5Mac

    Leaker teases Dynamic Island’s ‘significant evolution’ ahead

    Leaker teases Dynamic Island’s ‘significant evolution’ ahead

    July 11, 2025 – Apple’s plans for new Macs, iPads, and more

    Apple Watch Ultra 3: Three new features are coming next year

    Apple Watch Ultra 3: Three new features are coming this fall

    Report: Apple set to land US F1 streaming rights in $150 million+ deal

    Report: Apple set to land US F1 streaming rights in $150 million+ deal

    Fresh leak confirms new iPhone 17 and iPhone 17 Air colors

    Fresh leak confirms new iPhone 17 and iPhone 17 Air colors

    Apple reviving its discontinued AirPort router has never looked more likely

    Apple’s AirPort products are now ‘obsolete,’ with one exception

    Apple leaders join Sun Valley gathering of tech & media

    Apple leaders join Sun Valley gathering of tech & media

    Tim Cook thanks American heroes in Memorial Day post on X

    Gallery: Tim Cook and Eddy Cue attend Sun Valley ‘summer camp for billionaires’

  • ComputerWorld
    AI coding tools can slow down seasoned developers by 19%

    AI coding tools can slow down seasoned developers by 19%

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

    A magically minimalist Android makeover – Computerworld

    A magically minimalist Android makeover – Computerworld

    From conversation to task completion – Computerworld

    From conversation to task completion – Computerworld

    OpenAI and Perplexity enter browser wars to take on Chrome – Computerworld

    OpenAI and Perplexity enter browser wars to take on Chrome – Computerworld

    Using OneDrive for Web – Computerworld

    Using OneDrive for Web – Computerworld

  • Gaming
    Zelda Breath of the Wild – 27 Ways to Make a Campfire

    Zelda Breath of the Wild – 27 Ways to Make a Campfire

    Ocarina of Time Walkthrough Let's Play – Part 3

    Ocarina of Time Walkthrough Let's Play – Part 3

    Should Charles Martinet voice Mario in The Super Mario Bros. Movie?*

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    Final Fantasy producer Yoshi-P says ‘there’s no clear-cut answer’ to whether Final Fantasy will return to turn-based RPGs, because the direction of the next Final Fantasy will be up to the directors of the next Final Fantasy

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    Zelda Ocarina of Time 3D 100% Walkthrough – Part 72/78 – Gerudo Training Ground Part 1 (Commentary)

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    Capcom celebrates the first anniversary of Kunitsu-Gami: Path of the Goddess by ripping out its Denuvo DRM

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    Playdead’s classic minimalist platformers Limbo and Inside are being pulled from GOG next week, so grab ’em while you can

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  • Retro Rewind
    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

  • Tech Art
    How Artificial Intelligence is slowly becoming less art-ificial | Amir Baradaran | TEDxBocaRaton

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    AI Generative Art 1 – Robots | Vortex Creative

  • Tech Deals
    Hitachi 322898 Side Handle C10FCE2 C10FCH2 Replacement Part

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Home Hacker News

Slicing the Fourth

Hacker News by Hacker News
January 28, 2025
in Hacker News
Reading Time: 15 mins read
126
A A
0

2025-01-28 16:09:00
axalatar.github.io

What is the fourth dimension?

What is the fourth dimension? What does it mean for there to be another?

First, let’s explain what a dimension is. In essence, a dimension is just a direction. Imagine a man living
on a
line:

He can move either left or right on the line. We can understand this means he has one direction; the line is
one-dimensional. Formally, any position on the line can be described with a single number. We can call that
position
on the line x.

Now, imagine we give him a ladder that he can move along his line.

He can now move left and right, and up and down. There are two directions; he can now move two-dimensionally.
To
describe any one position now, we need two numbers, x like before, as well as a new number y to show his
‘height’ on
the ladder.

This should all feel very familiar, as you’ve seen 2d graphs like this
in every math class for as long as you can remember. How does this help
us understand 4d objects? Well, consider how Oliver (that’s his name now!)
thinks about you. Yes, you! Looking at him on the screen, you’re viewing him
from another direction, which we can call the z axis (an ‘axis’ just means a direction).
He can’t turn towards the screen, so from his perspective you don’t exist. However, what
happens if you put your hand next to your screen?

Come on, do it! Really!

You’re not flat, but Oliver can still see the part of your hand that intersects with the area
he can see, which is the flat plane of the screen. Imagining the intersection of your finger
and the plane, you can see it’s just something like a circle. We call this the cross-section
of the plane and the finger.

Let’s say we want to show Oliver what a cube is
(you could use a more complex shape, but the math will get harder).

How could we do it? Well, imagine we take a magic floating cube next to the screen. If we
move it fully from one side to the other, Oliver could see the whole thing, just through the
individual cross-sections.

…but to him, what would it look like? Try to figure it out on your own before continuing.





3

Try turning and zooming in/out the simulation; you’ll be able to do the same with
all other simulations on this page.

It’s a square. It makes sense; the cube is aligned to the plane, so when the cube enters or leaves
the plane, all levels of the cube at that z-level enter/leave at the same time. Mathematically,
we can see this by looking at the equation of the cube and plane. If we imagine Oliver
to be the origin (where x, y, and z = 0) and the cube to be a ‘unit cube’ where
the side length = 1, then we can say the plane is defined as

$$z = 0$$

and the cube is defined as

$$
\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}\\
{\displaystyle -0.5\leqslant z\leqslant 0.5}
\end{gather*}
$$

so, to find the cross-section we can just plug the z value from the
first equation to the second:

$$
\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}
\end{gather*}
$$

and, this is the equation of a square. Perfect! Now,
let’s get back to the point. What is the fourth dimension? First, extend your knowledge from the prior
exercise
to your own world– the real world. You are Oliver. What does that mean? Well, try to imagine our entire
universe– everything, everywhere– existing on a flat, three-dimensional ‘hyperplane’ (plane is specific to
2D).
Now, there are still our three axes (\(x\), \(y\), and \(z\)), but there is also a fourth one, which we can
call \(w\). As
Oliver,
you can’t turn towards \(w\), but you can still understand it’s there by extending your knowledge of how a
2D
creature might exist in a 3D world. But, bad news; the magic floating unit cube is back, and now it has
another
dimension! Now, instead of just being a cube, it’s a 4D hypercube, also called a tesseract. Rather than a
cube,
which is made up of six squares, or a square, which is made up of 4 lines, a tesseract is made of 8 cubes.
Do
you see the pattern?

Challenge

Try to figure out why. How do you construct a cube from squares, or a square
from lines?

Mathematically, it can be described as

$$
\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}\\
{\displaystyle -0.5\leqslant z\leqslant 0.5}\\
{\displaystyle -0.5\leqslant w\leqslant 0.5}
\end{gather*}
$$

So… what would you see? What object would appear in front of you as the hypercube moved through the
w-axis? Think about it, and then scroll down.





3

You probably could’ve seen this coming, but it’s a cube. Setting \(w\) to zero with the same
logic we used earlier, you can see the cross-section is

$$
\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}\\
{\displaystyle -0.5\leqslant z\leqslant 0.5}
\end{gather*}
$$

as you
can probably tell, this is the equation of a cube. Perfect. So, great. We can make cubes appear and
disappear. But what about the fourth dimension? All those cool gifs of weird rotating geometries
labeled
tesseracts? What about those? Well, first let’s revisit Oliver.

You might have
noticed an issue with our earlier ‘simulations’ of the intersections. It assumes that the cubes are always
aligned perfectly with the planes. But, what if that’s not the case?

this is the same cube,
rotated 45 degrees around each axis. Imagine what Oliver would see now, as the plane moves through the
z-axis. Try to figure it out, and then test your thoughts:




3


first, there is a single point, which grows into a triangle, then grows
into more complex shapes, before shrinking back into a triangle, then to a point, then disappearing. Just
looking at the shape of the rotated cube, it makes sense; the plane first intersects the tip, then
intersects along the pyramidical section of the cube, then begins reaching the other edges of the cube which
add more complex sides, until it reaches the midpoint; and then begins shrinking on the other side, which is
opposite to the first. How about the math, though?

The part with a lot of math

First, we know the cube can be represented as
$$

\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}\\
{\displaystyle -0.5\leqslant z\leqslant 0.5}
\end{gather*}
$$ but what about the rotations? Well, for those of you who
haven’t learned matrices yet, there’s a great math tool called a rotation matrix. It lets you rotate a
position around the origin counterclockwise by some angle on some axis. To use it, we just need to take
these
three matrices:
$$

\begin{gather*}
R_{x} =\begin{pmatrix}
1 & 0 & 0\\
0 & \cos \theta & -\sin \theta \\
0 & \sin \theta & \cos \theta
\end{pmatrix}\\
R_{y} =\begin{pmatrix}
\cos \theta & 0 & \sin \theta \\
0 & 1 & 0\\
-\sin \theta & 0 & \cos \theta
\end{pmatrix}\\
R_{z} =\begin{pmatrix}
\cos \theta & -\sin \theta & 0\\
\sin \theta & \cos \theta & 0\\
0 & 0 & 1
\end{pmatrix}
\end{gather*}
$$

and multiply our coordinates \(
\begin{equation*}
\begin{bmatrix}
x\\
y\\
z
\end{bmatrix}
\end{equation*}\)by them. We need to be careful the order we apply
them; matrix multiplication is not commutative, meaning order does matter. If we multiply
like this:
$$

\begin{equation*}
R_{z} \times R_{y} \times R_{x} \times \begin{bmatrix}
x\\
y\\
z
\end{bmatrix}
\end{equation*}
$$
which would seem to make sense; we do an \(x\) rotation, then a \(y\) rotation, then a \(z\)
rotation; then, for every subsequent rotation, the axes we are rotating around will also be rotated.
We don’t want
that, so instead we will use
$$

\begin{equation*}
R_{y} \times R_{x} \times R_{z} \times \begin{bmatrix}
x\\
y\\
z
\end{bmatrix}
\end{equation*}
$$
which is an extrinsic rotation; one that uses
fixed axes. To see why, see here.

Now, let’s multiply the matrices:
$$

\begin{equation*}
\begin{pmatrix}
1 & 0 & 0\\
0 & \cos \theta & -\sin \theta \\
0 & \sin \theta & \cos \theta
\end{pmatrix}\begin{pmatrix}
\cos \theta & 0 & \sin \theta \\
0 & 1 & 0\\
-\sin \theta & 0 & \cos \theta
\end{pmatrix}\begin{pmatrix}
\cos \theta & -\sin \theta & 0\\
\sin \theta & \cos \theta & 0\\
0 & 0 & 1
\end{pmatrix}\begin{bmatrix}
x\\
y\\
z
\end{bmatrix}
\end{equation*}
$$
$$

\begin{equation*}
=\begin{bmatrix}
x\cos^{2} \theta -y\sin \theta \cos \theta +z\sin \theta \\
x\left(\sin^{2} \theta \cos \theta +\sin \theta \cos \theta \right) +y\left(\cos^{2} \theta -\sin^{3} \theta
\right) -z\sin \theta \cos \theta \\
x\left(\sin^{2} \theta -\sin \theta \cos^{2} \theta \right) +y\left(\sin^{2} \theta \cos \theta +\sin \theta
\cos \theta \right) +z\cos^{2} \theta
\end{bmatrix}
\end{equation*}
$$
It’s a bit of a big vector, but remember that our theta is 45 degrees, and that
$$

\begin{equation*}
\sin 45 =\cos 45 =\frac{\sqrt{2}}{2}
\end{equation*} $$

Using that property and simplifying gives us this final vector:
$$

\begin{equation*}
=\begin{bmatrix}
\frac{x-y+z\sqrt{2}}{2}\\
\frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y-2z}{4}\\
\frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y+2z}{4}
\end{bmatrix}
\end{equation*}
$$
So, this tells us that
$$
\begin{gather*}
x’=\frac{x-y+z\sqrt{2}}{2}\\
y’=\frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y-2z}{4}\\
z’=\frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y+2z}{4}
\end{gather*}
$$
The apostrophe means that those are the rotated positions. So, great! We have the system of equations that
will give us a position rotated by 45 degrees on each axis. Now, how do we turn this into a rotated cube?
Try to figure it out, and then scroll down!


Well, first, look at our earlier inequalities we
used to describe a cube: $$
\begin{gather*}
{\displaystyle -0.5\leqslant x\leqslant 0.5}\\
{\displaystyle -0.5\leqslant y\leqslant 0.5}\\
{\displaystyle -0.5\leqslant z\leqslant 0.5}
\end{gather*}
$$ What that’s saying is that the \(x\), \(y\),
and \(z\) values have to be between -0.5 and 0.5; this forms a cube with side length 1 centered at \((0, 0,
0)\).
Great. We already know this. But, what if instead, we said this:
$$
\begin{gather*}
-0.5\leqslant x’\leqslant 0.5\\
-0.5\leqslant y’\leqslant 0.5\\
-0.5\leqslant z’\leqslant 0.5
\end{gather*}
$$
A little weirder, but it still looks right. But think about what it really means; \(x’\), \(y’\), and \(z’\)
are
all defined in terms of \(x\), \(y\), and \(z\). This means what we’re really solving for is the
\(x\), \(y\), and \(z\) values
which, when rotated by \(\theta\), form a normal cube. Understand the difference of that and finding the
\(x\), \(y\),
and \(z\) values which form a cube rotated by \(\theta\). There’s a trick to it, though; there’s only one
cube which,
when rotated by \(\theta\), is a normal cube. It’s a cube rotated by \(-\theta\). That way, the rotations
cancel out
and the cube is back to where it started. This means that when we set the \(\theta\), we’re actually
rotating the
cube by \(-\theta\).

…however, we don’t really need to worry about this. Careful readers would have noticed
that earlier, I said that rotation matrices rotate counterclockwise. In reality, we want to be
rotating
clockwise; so, reversing the direction of the rotation is actually correct in this case. Now, great! We have
these inequalities, which create our rotated cube:
$$
\begin{gather*}
-0.5\leqslant x’\leqslant 0.5\\
-0.5\leqslant y’\leqslant 0.5\\
-0.5\leqslant z’\leqslant 0.5
\end{gather*}
$$
and,
let’s expand them with our earlier definitions:
$$

\begin{gather*}
-0.5\leqslant \frac{x-y+z\sqrt{2}}{2} \leqslant 0.5\\
-0.5\leqslant \frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y-2z}{4} \leqslant 0.5\\
-0.5\leqslant \frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y+2z}{4} \leqslant 0.5
\end{gather*}
$$ This is the full
system of equations of our rotated cube. Now, how can we find the cross-section of this rotated cube and
Oliver’s plane (the xy plane)? Try to figure it out, and then scroll down.


Now, this should
feel somewhat familiar; we had the same problem earlier with a normal cube. Last time, we just set the \(z\)
to
0, and this time we want to do something very similar. Take a look at the third inequality: $$

\begin{gather*}
-0.5\leqslant \frac{x-y+z\sqrt{2}}{2} \leqslant 0.5\\
-0.5\leqslant \frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y-2z}{4} \leqslant 0.5\\
-0.5\leqslant \frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y+2z}{4} \leqslant 0.5
\end{gather*}
$$ remember, that section is equal to \(z’\), or the \(z\) value of the rotated cube after
it is rotated back into a normal cube
. We want to set the z to be 0 when it is still rotated,
because
that’s what we’re gonna actually see. Clearly, the variable that does that is \(z\). Now, if we say \(
\begin{equation*}
z=0
\end{equation*}\),
$$

\begin{gather*}
-0.5\leqslant \frac{x-y}{2} \leqslant 0.5\\
-0.5\leqslant \frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y}{4} \leqslant 0.5\\
-0.5\leqslant \frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y}{4} \leqslant 0.5
\end{gather*}
$$ This is some shape in terms of \(x\) and \(y\), which immediately can tell us that it’s a shape
Oliver can see. We could break this down further, but at this point it’s easiest to just plot it and find
out. Let’s see!

It looks like some sort of irregular hexagon.
Interesting!

Challenge

You could have figured out this would have been some sort of hexagon before we did
any math–
for an extra challenge, figure out how!

If we shift the
shape around on the z-axis, we can see the different sections. You can acheive this by adding another term
to the equations, to represent the z-shift. We’ll call it \(k\). In our new system,
$$

\begin{gather*}
-0.5\leqslant \frac{x-y+( z-k)\sqrt{2}}{2} \leqslant 0.5\\
-0.5\leqslant \frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y-2( z-k)}{4} \leqslant 0.5\\
-0.5\leqslant \frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y+2( z-k)}{4} \leqslant 0.5
\end{gather*}
$$
and with \(
\begin{equation*}
z=0
\end{equation*}\), $$
\begin{gather*}
-0.5\leqslant \frac{x-y-k\sqrt{2}}{2} \leqslant 0.5\\
-0.5\leqslant \frac{\left( 2+\sqrt{2}\right) x-\left(\sqrt{2} -2\right) y+2k)}{4} \leqslant 0.5\\
-0.5\leqslant \frac{-\left(\sqrt{2} -2\right) x+\left( 2+\sqrt{2}\right) y-2k)}{4} \leqslant 0.5
\end{gather*}$$ try
playing around with this in Desmos! This is already a massive block of math so I’m going to move onto
different stuff now, but have some fun with it! Try looking at different rotations, or even different
shapes!

ps. if you want to check this out on Desmos, go here.

The cool part

Phew. For anyone who didn’t check out the math section, it was a lot. But, we’re free now! If you just
went
through that with me, maybe go grab a cup of water, take a break for a moment. I know I did.

…but, now,
we’re back to it. So! You probably saw this coming, but, again, you are Oliver. The magic floating hypercube
rotated 45 degrees on each axis, and now it’s intersecting our 3D hyperplane. What would we see?
Think, and then scroll down.


…wait, but before we get there, hold on a second. What does it mean for a hypercube to be ‘rotated’
? This brings us to our next question– what is a rotation? First, consider our world. Good ol’
\(x\), \(y\), and
\(z\). How many rotations are there? Three, of course. But what about 2D? Let’s go back to Oliver. How can
he
rotate?

Just one, of course. But hang on; we always talk about rotating
around the x-axis, or the y-axis, or the z-axis. If there’s one for each axis, why can’t he rotate in two
ways–
one for \(x\), and one for \(y\)? The reason is that there isn’t one rotation for each axis. At
least, not
usually. In reality, there’s one rotation for each plane. He has one plane; xy. We have three planes,
xy,
xz, and yz. Our hypercube has 6: xy, xz, xw, yz, yw, and zw.

Fun Fact

Only in three dimensions is there
the same number of axes and planes!

So, if that’s the case, which of those planes will we rotate? For the
sake of it, we’ll for now say xw; but, we’re going to come back to this later. Now, for real this time, what
do you think it’ll look like?




3

Looks
weird, right? But, thinking about what it is, it makes sense. We’re starting at one edge of the
hypercube and moving towards the longer midsection. Now, what if there’s more than one rotation, like how we rotated
the earlier cube 45 degrees on every axis? This hypercube is rotated by 45 degrees on xw, yw, and zw. Check
it out, and try to understand why.




3

it seems
almost similar to the simulation with the cube, right? It begins with a point, before growing to a pyramid–
like the cube’s triangle– before growing into more complex and harder to describe shapes as more faces
intersect with the hyperplane. Then, once it reaches its midpoints, it symmetrically shrinks back down to a
point.

…and, that’s it. That’s pretty much all I’ve got for you. For fun, here’s a simulation where you
get all the control. Go wild, try to figure out what’s going on.

They
always call themselves 4D… but how is it? We never talked about that, right? Well, we’ve been talking
about cross-sections. This is a different way of representing them, called projection. It’s the more common
(and more boring) way of doing it; you just take all the points, and apply a matrix to get it down to \(
\begin{equation*}
\begin{bmatrix}
x\\
y\\
z
\end{bmatrix}
\end{equation*}\). For example, you can use an ‘orthographic’ projection, where you take (\(x\), \(y\), \(z\), \(w\)) and truncate
it down to (\(x\),
\(y\), \(z\)). That’s it.
If you want, you can play with one here:

Source Link


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