List questions from proof-explanation

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106

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How can this condition of concurrency of three lines be understood?

Published on 13 Apr 2026 - 2:49

156

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Any small limit in Set may be expressed as an equalizer of a pair of maps between products (Help in understanding the proof)

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66

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Inequalities on determinants of rational matrices.

Published on 12 Apr 2026 - 22:22

550

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Understanding Rudin's proof of: Every bounded sequence in $R^k$ contains a convergent sequence

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515

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Dimension theorem (in infinite dimension) - all basis of any vector space have the same cardinality.

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73

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Proving $(A - B) \times (C - D) = (A \times C - B \times C) - A \times D$

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78

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Demonstration of Peano's Existence theorem by delayed argument

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108

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Arnold on proof of uniqueness

Published on 10 Apr 2026 - 0:09

111

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Injectives envelopes (hulls) in Grothendieck categories: proof from the Freyd's book

Published on 16 Apr 2026 - 10:50

119

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Billiards in an ellipse -- a query from a proof

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23

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How does following function notations work in terms of scalar multiplication?

Published on 08 Apr 2026 - 14:56

44

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Establishing set equivalence: Munkres exercise 1.7

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32

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Need help proving A $\subseteq$ B or B $\subseteq$ A.

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59

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A step in the proof of Erdos-Tetali Lemma.

Published on 25 Mar 2026 - 17:40

List Question

Prove that $f$ is continuous only at $x=0$

How can this condition of concurrency of three lines be understood?

Any small limit in Set may be expressed as an equalizer of a pair of maps between products (Help in understanding the proof)

Inequalities on determinants of rational matrices.

Understanding Rudin's proof of: Every bounded sequence in $R^k$ contains a convergent sequence

Dimension theorem (in infinite dimension) - all basis of any vector space have the same cardinality.

Proving $(A - B) \times (C - D) = (A \times C - B \times C) - A \times D$

Demonstration of Peano's Existence theorem by delayed argument

Arnold on proof of uniqueness

Injectives envelopes (hulls) in Grothendieck categories: proof from the Freyd's book

Billiards in an ellipse -- a query from a proof

How does following function notations work in terms of scalar multiplication?

Establishing set equivalence: Munkres exercise 1.7

Need help proving A $\subseteq$ B or B $\subseteq$ A.

A step in the proof of Erdos-Tetali Lemma.

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