List questions from proof-verification

Published on 14 Apr 2026 - 13:20

338

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Error in Proof for $E(XY|X) = XE(Y|X)$

Published on 15 Apr 2026 - 2:07

154

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pointwise approximation to the identity

Published on 11 Apr 2026 - 5:01

70

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Proving or disproving gcd and lcm

Published on 15 Apr 2026 - 8:49

268

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Proving modular arithmetic using its contrapositive

Published on 13 Apr 2026 - 2:28

43

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combinatorics problem: ordering people from small to large. Is my solution correct?

Published on 15 Apr 2026 - 10:12

1.6k

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How do I show $\arctan x$ is real analytic on $\mathbb{R}$?

Published on 10 May 2026 - 19:03

4.4k

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Why are permutations defined as bijective?

Published on 11 Apr 2026 - 22:33

299

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Proof of the Alaoglu Theorem

Published on 10 May 2026 - 17:36

189

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Let k⊆K⊆E fields and if E/k is a finite extension, the E/K and K/k are also finite extensions.

Published on 12 Apr 2026 - 5:45

202

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Proving g(x) is continuous at x = 0

Published on 14 Apr 2026 - 5:29

53

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Where is the problem with this "proof" that $T^2 \# RP^2 = RP^2 \# RP^2$?

Published on 10 Apr 2026 - 22:39

36

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Proving equality of Sets three sets

Published on 13 Apr 2026 - 20:13

51

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Integrating with different methods leads to different results?

Published on 08 Apr 2026 - 17:05

46

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$f : M → M$ be a transitive continuous transformation, if $\phi \circ f=\phi$, then $\phi$ is constant.

Published on 16 Apr 2026 - 1:07

List Question

$8^n-3^n$ Divisible by 5 - Proof Verification.

Error in Proof for $E(XY|X) = XE(Y|X)$

pointwise approximation to the identity

Proving or disproving gcd and lcm

Proving modular arithmetic using its contrapositive

combinatorics problem: ordering people from small to large. Is my solution correct?

How do I show $\arctan x$ is real analytic on $\mathbb{R}$?

Why are permutations defined as bijective?

Proof of the Alaoglu Theorem

Let k⊆K⊆E fields and if E/k is a finite extension, the E/K and K/k are also finite extensions.

Proving g(x) is continuous at x = 0

Where is the problem with this "proof" that $T^2 \# RP^2 = RP^2 \# RP^2$?

Proving equality of Sets three sets

Integrating with different methods leads to different results?

$f : M → M$ be a transitive continuous transformation, if $\phi \circ f=\phi$, then $\phi$ is constant.

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