List questions from proof-explanation

Published on 16 Apr 2026 - 12:35

30

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Question about some algebra of conditional expectation

Published on 12 Apr 2026 - 5:30

183

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How would I prove $-a=(-1)a$ for any integer $a$ using Peano axioms?

Published on 11 Apr 2026 - 23:58

1.3k

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Doubt in understanding Space $\mathscr D(\Omega)$

Published on 09 Apr 2026 - 0:14

113

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Prove by case; if $n$ is an odd integer, then there is an integer $m$ such that $n=4m+1$ or $n=4m+3$

Published on 15 Apr 2026 - 23:20

133

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Doubt in understanding 6.3 form Rudin functional analysis

Published on 09 Apr 2026 - 1:08

169

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Conceptual question about the strategy used in the following theorem: Every Ideal of $F[x]$ is Principal

Published on 09 Apr 2026 - 21:53

566

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Total order on irrational numbers

Published on 09 Apr 2026 - 11:32

150

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Corollary 5.4. in Brezis Book; $y=P_Wx\iff y\in W \ \text{and} \ \langle x-y, \omega \rangle =0.$

Published on 15 Apr 2026 - 4:43

118

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When is $F(x) = P(X \leq x) = P(X^2 \leq x^2)$?

Published on 25 Mar 2026 - 7:45

39

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Showing $f(x) \geq 2f(\frac{u+v}{2})-f(\frac{u+v}{2}-t)$ for $f$ convex

Published on 16 Apr 2026 - 11:37

32

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Proving $f$ is convex IFF for every compact subinterval and every affine function $L$, $\sup(f+L)$ is at an endpoint

Published on 15 Apr 2026 - 15:19

42

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Game theory: Help with understanding the proof that any finite, strictly competitve game of perfect information without chance moves has a value

Published on 22 Apr 2026 - 15:54

92

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Proof of the general Hurewicz theorem

Published on 11 Apr 2026 - 20:21

117

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How to prove Conway's magic theorem for planes

Published on 08 Apr 2026 - 21:37

List Question

Derive ideal form of Bézout's Identity: $a\Bbb Z + b\Bbb Z = \gcd(a,b)\Bbb Z$

Question about some algebra of conditional expectation

How would I prove $-a=(-1)a$ for any integer $a$ using Peano axioms?

Doubt in understanding Space $\mathscr D(\Omega)$

Prove by case; if $n$ is an odd integer, then there is an integer $m$ such that $n=4m+1$ or $n=4m+3$

Doubt in understanding 6.3 form Rudin functional analysis

Conceptual question about the strategy used in the following theorem: Every Ideal of $F[x]$ is Principal

Total order on irrational numbers

Corollary 5.4. in Brezis Book; $y=P_Wx\iff y\in W \ \text{and} \ \langle x-y, \omega \rangle =0.$

When is $F(x) = P(X \leq x) = P(X^2 \leq x^2)$?

Showing $f(x) \geq 2f(\frac{u+v}{2})-f(\frac{u+v}{2}-t)$ for $f$ convex

Proving $f$ is convex IFF for every compact subinterval and every affine function $L$, $\sup(f+L)$ is at an endpoint

Game theory: Help with understanding the proof that any finite, strictly competitve game of perfect information without chance moves has a value

Proof of the general Hurewicz theorem

How to prove Conway's magic theorem for planes

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