List questions from proof-explanation

Published on 13 Apr 2026 - 4:04

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Proving $\operatorname{Var}(X) = E[X^2] - (E[X])^2$

Published on 16 Apr 2026 - 20:54

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Law of total expectation?

Published on 10 Apr 2026 - 2:28

459

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Class equation and orbit stabilizer theorem

Published on 10 Apr 2026 - 18:39

127

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Discrete Math Proof verification: products of floor

Published on 11 Apr 2026 - 1:05

128

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I don't understand how this proof works.

Published on 14 Apr 2026 - 0:10

102

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What kind of proof is this? - Examining all the possibilities.

Published on 11 Apr 2026 - 22:28

102

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Question 5, RMO 2003, issue with ratios

Published on 15 Apr 2026 - 3:37

36

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The intuition behind choosing this length?

Published on 13 Apr 2026 - 6:14

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Discrete Math Understanding a proof involving the definition of divisibility

Published on 09 Apr 2026 - 4:35

64

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Alternative proof: show that any metrizable space $X$ is normal - Part 2

Published on 15 Apr 2026 - 22:00

113

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Unable to reach the desired result by substituting a given solution into the Schrodinger equation

Published on 11 Apr 2026 - 16:54

50

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If $\lim_{n\to\infty} t_n = t$, prove that $|t_n - t| <\frac{|t|}{2}$ when $n\to\infty$.

Published on 15 Apr 2026 - 10:59

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Question about proof of Ore's Theorem

Published on 12 Apr 2026 - 19:00

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Proof by contradiction concerning prime numbers. Where is the contradiction?

Published on 14 Apr 2026 - 10:45

List Question

An unexplained condition on $a$ in a proof on the primes?

Proving $\operatorname{Var}(X) = E[X^2] - (E[X])^2$

Law of total expectation?

Class equation and orbit stabilizer theorem

Discrete Math Proof verification: products of floor

I don't understand how this proof works.

What kind of proof is this? - Examining all the possibilities.

Question 5, RMO 2003, issue with ratios

The intuition behind choosing this length?

Discrete Math Understanding a proof involving the definition of divisibility

Alternative proof: show that any metrizable space $X$ is normal - Part 2

Unable to reach the desired result by substituting a given solution into the Schrodinger equation

If $\lim_{n\to\infty} t_n = t$, prove that $|t_n - t| <\frac{|t|}{2}$ when $n\to\infty$.

Question about proof of Ore's Theorem

Proof by contradiction concerning prime numbers. Where is the contradiction?

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