List questions from alternative-proof

221

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Having some trouble with proving for some sets $M,N$ that $M \cap N = M$ if and only if $M \subseteq N$

Published on 22 Apr 2026 - 21:31

241

Views

Poincaré's Theorem using Schwarz Lemma in $\mathbb C^n$

Published on 14 Apr 2026 - 21:03

164

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Number of Subsets of Cardinality at most $k$ of a Finite Set

Published on 15 Apr 2026 - 13:21

51

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Pointwise limit of a sequence of measurable functions is measurable.

Published on 16 Apr 2026 - 0:21

97

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Elementary proof that one cannot cover a unit disk with countably many curves

Published on 14 Apr 2026 - 0:12

174

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Subsets of Well-ordered Sets

Published on 11 Apr 2026 - 17:12

110

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Prove that x $\in y$ iff $\{x\}\subseteq y$

Published on 14 Apr 2026 - 12:13

216

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Simple Random Walk and the Strong Markov Property

Published on 12 Apr 2026 - 11:12

106

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Proving the inverse of an orthogonal matrix is orthogonal. (Proof check)

Published on 14 Apr 2026 - 2:36

186

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Other proof for perimeter of a circle

Published on 13 Apr 2026 - 14:27

100

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Exercise 2(a), Section 26 of Munkres’ Topology

Published on 13 Apr 2026 - 17:13

248

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Exercise 1, Section 26 of Munkres’ Topology

Published on 13 Apr 2026 - 23:07

114

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What's so hard about contradiction proofs w.r.t. primes?

Published on 15 Apr 2026 - 19:11

217

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Then Convex Conjugate is Lower Semi Continuous

Published on 13 Apr 2026 - 2:04

130

Views

Proofs-request: Proofs that five exponention rules hold for positive real bases and rational exponents,using pre-calculus math

Published on 15 Apr 2026 - 21:57

List Question

Having some trouble with proving for some sets $M,N$ that $M \cap N = M$ if and only if $M \subseteq N$

Poincaré's Theorem using Schwarz Lemma in $\mathbb C^n$

Number of Subsets of Cardinality at most $k$ of a Finite Set

Pointwise limit of a sequence of measurable functions is measurable.

Elementary proof that one cannot cover a unit disk with countably many curves

Subsets of Well-ordered Sets

Prove that x $\in y$ iff $\{x\}\subseteq y$

Simple Random Walk and the Strong Markov Property

Proving the inverse of an orthogonal matrix is orthogonal. (Proof check)

Other proof for perimeter of a circle

Exercise 2(a), Section 26 of Munkres’ Topology

Exercise 1, Section 26 of Munkres’ Topology

What's so hard about contradiction proofs w.r.t. primes?

Then Convex Conjugate is Lower Semi Continuous

Proofs-request: Proofs that five exponention rules hold for positive real bases and rational exponents,using pre-calculus math

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