List questions from proof-explanation

Published on 24 Mar 2026 - 23:46

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Unclear definition of open sets in proof of Regular Lindelof space is normal

Published on 17 Mar 2026 - 14:31

124

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Is this Strong Induction approach?

Published on 14 Feb 2018 - 13:17

48

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Query Regarding Roots of Discriminant

Published on 22 Mar 2026 - 20:46

122

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About the proof of $\prod\overline A_{\alpha}\subset\overline{\prod A_{\alpha}}$

Published on 14 Feb 2018 - 22:08

205

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About the proof of $\overline{\prod A_{\alpha}}\subset \prod\overline A_{\alpha}$

Published on 15 Feb 2018 - 0:44

51

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Maclaurin Series of $e^{t^2/2}$

Published on 15 Feb 2018 - 1:14

617

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Prove that [(p ∨ q) ∧ (p → s) ∧ (q → t)] → (s ∨ t) without using truth tables. What is the proof technique used?

Published on 23 Mar 2026 - 12:44

1.3k

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If $X$ is first-countable and for $x_n\to x$ we have that $f(x_n)\to f(x)$, then $f$ is continuous.

Published on 15 Feb 2018 - 7:47

112

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On the conjecture that if $\,\forall\{x, y, z\}\subset \Bbb{Z^+}$ squarefree, and $\ x^3 + y^3 = z^2$, then $\gcd(3, x, y) = 1$.

Published on 25 Mar 2026 - 4:43

231

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Proposition 5.1 in Introduction to Topological Manifolds by Lee

Published on 17 Feb 2018 - 11:20

239

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proof of the mean value property in Evan's PDE book

Published on 17 Feb 2018 - 19:45

75

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How to show $f(x) = f(y) + \int\limits_0^1 \nabla f(y + t(x-y))^T(x-y)dt$?

Published on 25 Mar 2026 - 4:44

90

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Difficulty with Proof of Integrability

Published on 18 Feb 2018 - 0:38

2.6k

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Prove L' Hopitals Rule with Complex numbers

Published on 18 Feb 2018 - 0:38

List Question

What are the main tactics in proofs of theorems?

Unclear definition of open sets in proof of Regular Lindelof space is normal

Is this Strong Induction approach?

Query Regarding Roots of Discriminant

About the proof of $\prod\overline A_{\alpha}\subset\overline{\prod A_{\alpha}}$

About the proof of $\overline{\prod A_{\alpha}}\subset \prod\overline A_{\alpha}$

Maclaurin Series of $e^{t^2/2}$

Prove that [(p ∨ q) ∧ (p → s) ∧ (q → t)] → (s ∨ t) without using truth tables. What is the proof technique used?

If $X$ is first-countable and for $x_n\to x$ we have that $f(x_n)\to f(x)$, then $f$ is continuous.

On the conjecture that if $\,\forall\{x, y, z\}\subset \Bbb{Z^+}$ squarefree, and $\ x^3 + y^3 = z^2$, then $\gcd(3, x, y) = 1$.

Proposition 5.1 in Introduction to Topological Manifolds by Lee

proof of the mean value property in Evan's PDE book

How to show $f(x) = f(y) + \int\limits_0^1 \nabla f(y + t(x-y))^T(x-y)dt$?

Difficulty with Proof of Integrability

Prove L' Hopitals Rule with Complex numbers

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