List questions from solution-verification

Published on 25 Dec 2019 - 20:37

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Proof that the product of 3 sequential numbers is divisible by 3

Published on 25 Dec 2019 - 22:16

182

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Faulty calculation in Schubert calculus: the number of lines on the intersection of two planes.

Published on 25 Mar 2026 - 4:42

83

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When can we choose a covering local basis at a point which does not contain the whole space?

Published on 25 Mar 2026 - 19:05

74

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Continuous open maps

Published on 29 Mar 2026 - 14:34

182

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Continuous open maps and first countability

Published on 25 Mar 2026 - 9:44

30

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Is this a correct way of proof that logit is linear?

Published on 25 Mar 2026 - 22:03

346

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Use Grönwall's proof to prove boundedness of ODE's solution

Published on 26 Dec 2019 - 11:55

68

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The perpendicular bisected of the line segment joining $P(1,4)$ and $Q(k,3)$ has $y$-intercept $4$. Then the possible value of k is

Published on 26 Dec 2019 - 13:00

160

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Fundamental Theorem of Counting: invalid proof?

Published on 26 Dec 2019 - 13:18

302

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Locally euclidean and first countability

Published on 25 Mar 2026 - 9:53

604

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Show that, if a map $f: X \to Y$ is nullhomotopic then it extends to a map $f_*$ from the cone $CX$ to Y.

Published on 27 Mar 2026 - 1:00

344

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Find polynomials $P(x)P(x-3) = P(x^2)$

Published on 26 Dec 2019 - 15:31

212

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Proof verification in Hatcher's Algebraic Topology, Theorem 3.21

Published on 26 Dec 2019 - 16:44

52

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$f:I \to F$ is jump continuous if and only if there is a sequence of staircase functions converging uniformly to $f$

Published on 23 Feb 2026 - 9:50

List Question

How to prove $x^m+y^m\leq c (x+y)^m$ with $x,y>0$ and $c>0$

Proof that the product of 3 sequential numbers is divisible by 3

Faulty calculation in Schubert calculus: the number of lines on the intersection of two planes.

When can we choose a covering local basis at a point which does not contain the whole space?

Continuous open maps

Continuous open maps and first countability

Is this a correct way of proof that logit is linear?

Use Grönwall's proof to prove boundedness of ODE's solution

The perpendicular bisected of the line segment joining $P(1,4)$ and $Q(k,3)$ has $y$-intercept $4$. Then the possible value of k is

Fundamental Theorem of Counting: invalid proof?

Locally euclidean and first countability

Show that, if a map $f: X \to Y$ is nullhomotopic then it extends to a map $f_*$ from the cone $CX$ to Y.

Find polynomials $P(x)P(x-3) = P(x^2)$

Proof verification in Hatcher's Algebraic Topology, Theorem 3.21

$f:I \to F$ is jump continuous if and only if there is a sequence of staircase functions converging uniformly to $f$

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