User mma - MathOverflow

mma

Member for 11 years, 1 month
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Excavator

Oct 30, 2017
Editor

Oct 29, 2017
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Feb 4, 2016

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15

What is the opposite category of $Set$?

13

Generality of the Schrödinger equation

12

What is the true relationship between impossible figures and cohomology?

7

How does the existence of Platonic graphs imply the existence of Platonic solids?

7

Is it true, that every morphism in a product is a retraction?