what are sufficiently weird mathematical concepts to put up as posters in my apartment
most well-known i'm willing to go is the weierstrass function
@hazel This letter from Grothendieck is a classic: https://upload.wikimedia.org/wikipedia/commons/a/a8/Grothendieck-Riemann-Roch.jpg
@hazel It's the Grothendieck-Riemann-Roch theorem. It's a very generalized version of Riemann-Roch, which was originally a statement that counts the functions on a curve with given zeros and poles. The theorem went through many increasingly complex versions, until finally it was just "this diagram commutes".
"Witches Kitchen 1971. Riemann-Roch Theorem: The final cry: The diagram is commutative! To give an approximate sense to the statement about f: X → Y, I had to abuse the listeners' patience for almost two hours. Black on white (in Springer lecture notes) it probably takes about 400, 500 pages. A gripping example of how our thirst for knowledge and discovery indulges itself more and more in a logical delirium far removed from life, while life itself is going to Hell in a thousand ways and is under the threat of final extermination. High time to change our course!"
@hazel Also idk if this is too normal but people have made a "periodic table of finite simple groups".
@hazel poster of Gabriel's trumpet. only requires finite 1m^2 of paper but is impossible to fit on your wall lol
@hazel You could get some famous graphs in graph theory.
@hazel I’d suggest https://upload.wikimedia.org/wikipedia/commons/d/d7/Principia_Mathematica_54-43.png (for the meme factor alone).
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