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# 199 Questions

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### Friend B and C have eaten zero apples. How many more apples has C eaten?

dec 3 at 11:51 Kasper 4,520

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### No rigorous proofs from 200 B.C to 1870?

jan 24 '15 at 23:22 Kasper 4,520

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### Direct proof that $\sqrt{2}$ is irrational? [duplicate]

nov 11 '14 at 13:25 robjohn 198k
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### Let $A''=\operatorname{End}_{A'}(V)=\operatorname{End}_{\operatorname{End}_A(V)}(V)$. Show that $A''$ is a $k$-algebra.

oct 17 '14 at 14:55 Kasper 4,520

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### Using upshape (non-italic) variables in mathematics

oct 9 '14 at 11:54 Kasper 4,520
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