List questions from proof-explanation

Published on 03 Oct 2019 - 16:34

46

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Prove the following using only the results contained herein.

Published on 11 Apr 2026 - 23:07

416

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Gentzen system, how to?

Published on 09 Apr 2026 - 19:22

64

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The rectangle contour in $p.v. \int_{-\infty}^{\infty} \frac{e^{ax}}{1+e^x} dx$

Published on 04 Oct 2019 - 1:21

268

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Proof: $\mathbb{Z}_n$ has zero divisors if and only if $n$ is not prime.

Published on 13 Apr 2026 - 0:25

98

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Nuances of Cantor Intersection Theorem

Published on 12 Apr 2026 - 20:02

76

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Number of representations of numbers in a given radix

Published on 04 Oct 2019 - 11:09

324

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Proof of Baer's criterion: what set to apply Zorn on?

Published on 26 Mar 2026 - 2:46

46

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How to justify saying WLOG in this scenerio?

Published on 12 Apr 2026 - 11:31

37

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Can someone explain how the induction step is carried out in this proof?

Published on 05 Oct 2019 - 16:06

92

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Application of Modus Tollens rule in nested proof confusion

Published on 25 Mar 2026 - 21:48

793

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How to prove or disprove matrices $A$ and $B$ commute iff $(A-B)(A+B)=A^2-B^2$?

Published on 06 Oct 2019 - 10:19

103

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$\sum_{k=0}^{\lfloor{\frac{n}{2}}\rfloor} \binom{n-k}{k} = F_{n+1}$

Published on 06 Oct 2019 - 12:53

650

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Trace of SVD low rank in Frobenius norm

Published on 26 Mar 2026 - 16:06

33

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Is this a typo in this econometric exercise?

Published on 26 Mar 2026 - 18:59

List Question

Show that if $\langle f,g\rangle=\langle k,h\rangle$ then $f=k$ and $g=h$

Prove the following using only the results contained herein.

Gentzen system, how to?

The rectangle contour in $p.v. \int_{-\infty}^{\infty} \frac{e^{ax}}{1+e^x} dx$

Proof: $\mathbb{Z}_n$ has zero divisors if and only if $n$ is not prime.

Nuances of Cantor Intersection Theorem

Number of representations of numbers in a given radix

Proof of Baer's criterion: what set to apply Zorn on?

How to justify saying WLOG in this scenerio?

Can someone explain how the induction step is carried out in this proof?

Application of Modus Tollens rule in nested proof confusion

How to prove or disprove matrices $A$ and $B$ commute iff $(A-B)(A+B)=A^2-B^2$?

$\sum_{k=0}^{\lfloor{\frac{n}{2}}\rfloor} \binom{n-k}{k} = F_{n+1}$

Trace of SVD low rank in Frobenius norm

Is this a typo in this econometric exercise?

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