Hey any #math people here? I have a math problem that I need someone to explain to me like I'm 10.

The math problem is like this: if I have a 2d projection of a 3d landscape, things get smaller as they get farther away. So let's say that there's an object that is moving from position 1 to position 2. I know how much smaller this object gets, but I don't know 3d coordinates or anything, only 2d. I want to calculate what should be the apparent velocity on the projection. Obviously on the y axis it should be slower! But by how much? I have to figure this out only from the change in the object size.

Yes, this is #GameDev math.

"On peut douter qu'il y ait, dans toute la gamme des sciences, un domaine aussi fascinant pour l'explorateur – si riche en trésors cachés – si fécond en délicieuses surprises – que celui des mathématiques pures. Le charme réside principalement, je pense, dans la certitude absolue de ses résultats : car c'est ce à quoi, au-delà de presque tous les trésors mentaux, l'intellect humain aspire." – Lewis Carroll (1832-1898)
#citation #mathématiques #maths #math

"It may well be doubted whether, in all the range of Science, there is any field so fascinating to the explorer – so rich in hidden treasures – so fruitful in delightful surprises – as that of Pure Mathematics. The charm lies chiefly, I think, in the absolute certainty of its results: for that is what, beyond almost all mental treasures, the human intellect craves for." – Lewis Carroll (1832-1898)
#quote #mathematics #maths #math

Q: How many fields of order 8 does it take to change a light bulb?

A: Up to isomophism, there *is* only one field of order 8.

“I’m not going to attempt to draw this object [a 3-torus] as this is not an object that fits in three dimensional space.”

Ace video from Quanta Magazine about 4 dimensional geometry.

13-minute video: https://youtu.be/MURzTFRRuJQ

Theorem of the Day (June 8, 2025) : Kepler’s Conjecture
Source : Theorem of the Day / Robin Whitty
pdf : https://www.theoremoftheday.org/GeometryAndTrigonometry/Kepler/TotDKepler.pdf
notes : https://www.theoremoftheday.org/Resources/TheoremNotes.htm#101

#mathematics #maths #math #theorem @Theoremoftheday

I need some help from the fedi math gods.

It's easy to find the percentage difference between a and b, but how do I order correctly the same calculation for a lot of values (say, 10 or so) to get the relative percentage difference of the entire group ranked, (not just in pairs)?

Most advice I found says to calculate the average (makes sense) and divide the difference by the avg.

(trying to use this to calculate revenue share based on number of hours worked, in a spreadsheet)

"Nommer simplement l’idée, par quelque formule frappante, ou par des mots-clefs plus ou moins techniques, peut être affaire de quelques lignes, voire de quelques pages – mais rares seront ceux qui, sans déjà bien la connaître, sauront entendre ce 'nom' et y reconnaître un visage. Et quand l’idée est arrivée en pleine maturité, cent pages peut-être suffiront à l’exprimer [...]" – Alexandre Grothendieck (1928-2014)
#citation #mathématiques #maths #math

"To simply name the idea, by some striking formula, or by more or less technical keywords, may take a few lines, or even a few pages – but few will be those who, without already knowing it well, will be able to listen to this "name" and recognize a face in it. And when the idea has reached full maturity, a hundred pages may suffice to express it, to the full satisfaction of the worker in whom it was born [...]." – Alexandre Grothendieck (1928-2014)
#quote #mathematics #math #maths

Theorem of the Day (June 7, 2025) : Kasteleyn’s Theorem
Source : Theorem of the Day / Robin Whitty
pdf : https://www.theoremoftheday.org/MathPhysics/Kasteleyn/TotDKasteleyn.pdf
notes : https://www.theoremoftheday.org/Resources/TheoremNotes.htm#254

#mathematics #maths #math #theorem @Theoremoftheday

7 juin 1956 : #CeJourLà naissance de János Kollár, mathématicien hongrois dont les travaux portent essentiellement sur la géométrie algébrique.
https://fr.wikipedia.org/wiki/J%C3%A1nos_Koll%C3%A1r
#mathématiques #maths #math

This is so cool. I bet this will have great consequences somehow.

Astonishing discovery by computer scientist: how to squeeze space into time
by Chalk Talk

https://www.youtube.com/watch?v=p_AW6fomKPI

Binary Lambda Calculus https://lobste.rs/s/6ssfjk #math #plt
https://gist.github.com/tromp/86b3184f852f65bfb814e3ab0987d861

"The understanding of a mathematical theory is not the result of enlightened familiarity with an axiom system given once and for all. To the mathematician, an axiom system is a window through which an item, be it a group, a topological space or the real line, can be viewed from different angles that will reveal heretofore unsuspected possibilities."– Gian-Carlo Rota (1932-1999)
#quote #mathematics #math #maths

"La compréhension d'une théorie mathématique n'est pas le résultat d'une familiarité éclairée avec un système d'axiomes donné une fois pour toutes. Pour le mathématicien, un système d'axiomes est une fenêtre à travers laquelle un objet, qu'il s'agisse d'un groupe, d'un espace topologique ou de la droite réelle, peut être vu sous différents angles qui révéleront des possibilités jusqu'alors insoupçonnées."– Gian-Carlo Rota (1932-1999)
#citation #mathématiques #maths #math

Mon grand sera en terminale STI2D à la rentrée et l'année de première a été difficile en #math (et moi, je suis une bille en math)
Aussi, je suis à la recherche d'un ou plusieurs bouquins qui pourraient l'aider à se remettre à niveau pendant les vacances. Idem avec des sites ou des vidéastes.
Donc je lance un appel à la #teamprof ou toute personne qui a de l'expérience sur le sujet.

le repouet vous aide à comprendre la conjecture de Poincaré

Sharing everything I could understand about gradient noise https://lobste.rs/s/cnnp08 #compsci #math #programming
https://blog.pkh.me/p/42-sharing-everything-i-could-understand-about-gradient-noise.html