Escher's most mathematically interesting piece

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From: 3Blue1Brown
Duration: 44:52
Views: 9,684

Escher's Print Gallery, and the tour of complex analysis it invites.
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Original paper by de Smit and Lenstra:
https://pub.math.leidenuniv.nl/~smitbde/papers/2003-de_smit-lenstra-escher.pdf

Timestamps:

0:00 - The print gallery
13:04 - Conformal maps from complex analysis
21:41 - The complex exponential
25:56 - The complex logarithm
32:32 - 3b1b Talent
33:14 - Constructing the key function
40:16 - The deeper math behind Escher

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https://3b1b.co/faq#manim

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https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown
https://open.spotify.com/album/1dVyjwS8FBqXhRunaG5W5u

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jlvanderzwan
6 hours ago
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I have a friend, Laura Siekman, who did her master thesis in mathematics of Escher's etchings 😌 (technically the topic was "regular tilings of the hyperbolic plane", which is also the title of her thesis in Dutch, but that's just a mathematical description of a lot of Escher's work anyway). I remember she also kept trying to explain how interesting this picture was mathematically at the time she wrote it twenty years ago.
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Do *you* understand ISO?

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From: minutephysics
Duration: 11:36
Views: 486,712

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This video explains how ISO is very different to what most people imagine, and how you can use this knowledge to take less noisy photos!

REFERENCES
- Sensor Analysis Primer: https://www.photonstophotos.net/GeneralTopics/Sensors_&_Raw/Sensor_Analysis_Primer/Photographic_Dynamic_Range_Shadow_Improvement.htm
- Image sensors explained: https://www.canon-europe.com/pro/infobank/image-sensors-explained/

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

Created by Henry Reich
Produced by Joshua Chawner

Chapters
0:00 Misunderstanding ISO
1:54 ISO Explained
3:20 Why Even Have ISO?
4:52 What Actually Creates Noise
7:12 ISO Step-by-Step Guide!
8:36 Sponsor Message from FarmKind
9:43 ISO Caveats

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jlvanderzwan
3 days ago
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TL;DW: in most cameras increasing the ISO setting works by pre-analog-to-digital voltage amplification, so using it should introduce less noise than digital brightening after the fact would. What this really means is that https://en.wikipedia.org/wiki/Exposing_to_the_right should also include increasing ISO if increasing aperture or exposure time won't cut it in the context of the picture you're taking.
ttencate
3 days ago
Now I wonder, all else being equal, do you get less noise with high exposure time/low ISO or vice versa?
jlvanderzwan
3 days ago
Each sensor has a "base ISO" level where it has the highest dynamic range, which might not the lowest one; you have to look that up per camera (DPReview usually has a chart if it does an in-depth review of a moded). As far as noise goes, it probably depends a lot on how bad the thermal noise is. That's the main reason amateur astrophotographers use stacks of relatively short exposures over extremely long ones IIRC (and also sometimes put their DSLR in portable beer fridges). Although there might also be some kind of averaging-out effect going on.
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The Weather Equation - Numberphile

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From: Numberphile
Duration: 44:12
Views: 22,136

Chief Meteorologist Dan Harris discusses (at length) one of the most famous equations in weather forecasting - the Quasi Geostrophic Omega Equation. More links & stuff in full description below ↓↓↓

Catch our podcast with Dan on podcast players or here on YouTube - https://youtu.be/lnARyhaqMvU

Dan works for the Met Office as a chief meteorologist - https://www.metoffice.gov.uk/

Check out some Met Office archive stuff at Brady's Objectivity channel - https://www.youtube.com/playlist?list=PLd5y2WfrtsPrauSfrdFfkE7iZ-KG9pCzO

Weather videos on Brady's Sixty Symbols channel - https://www.youtube.com/playlist?list=PLcUY9vudNKBNpsv8AWUvJxbOl6S2pw8so

Navier-Stokes Equation video - https://www.youtube.com/watch?v=ERBVFcutl3M

Dan's website - https://www.roostweather.com/

Patreon: http://www.patreon.com/numberphile

Numberphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://bit.ly/numberphile-janestreet

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NUMBERPHILE
Website: http://www.numberphile.com/

Video by Brady Haran and Pete McPartlan

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jlvanderzwan
5 days ago
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I gotta hand it to the meteorologists, "the Quasi Geostrophic Omega Equation" is a top-tier name for an equation
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Cyborg Therapy

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Cyborg Therapy

And more therapy.

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jlvanderzwan
5 days ago
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Is this an AI psychosis joke?
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Girl Genius for Monday, March 16, 2026

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The Girl Genius comic for Monday, March 16, 2026 has been posted.
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jlvanderzwan
8 days ago
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Never seen a monster with six eyes do the "Pixar face" before
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Mouse

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jlvanderzwan
8 days ago
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https://www.youtube.com/watch?v=lKMD4t2Dbl8
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