List questions from solution-verification

Published on 14 Apr 2026 - 4:06

312

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Proof of maximum principle of Cauchy integral.

Published on 09 Apr 2026 - 16:27

206

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Prove that if $A \subseteq B$ and $A \subseteq C$ then $A \subseteq B \cap C$.

Published on 15 Apr 2026 - 17:12

57

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Can $\{(x,y) \mid x^2 + y^2 < 1\}$ can be written as the cartesian product of two subsets of $\mathbb{R}$?

Published on 14 Apr 2026 - 6:42

737

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For the ellipse $b^2x^2+a^2y^2=a^2b^2$, show that the equations of the tangent lines of slope $m$ are $y=mx\pm \sqrt{a^2m^2+b^2}.$

Published on 15 Apr 2026 - 20:32

89

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Explicit bijection between $\mathbb{N}$ and $\mathbb{N}^2$

Published on 12 Apr 2026 - 12:37

297

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Birthday Problem Proof?

Published on 14 Apr 2026 - 8:56

49

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Is this proof that Cauchy sequences converge right?

Published on 15 Apr 2026 - 2:45

139

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Expected value of a Bernoulli parameter given a sample

Published on 14 Apr 2026 - 4:32

489

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Find the flaw in this proof that $1$ is the greatest natural number

Published on 27 Mar 2026 - 2:37

40

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Question in linear algebra regarding null spaces and linear maps

Published on 13 Apr 2026 - 12:19

98

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Rouché's theorem example verification

Published on 11 Apr 2026 - 12:01

30

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Show if $f_x \rightarrow \eta \,\,\,$ and $g_x \rightarrow \zeta$ so $f_x+g_x \rightarrow \eta + \zeta$

Published on 15 Apr 2026 - 18:28

223

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How to prove $|{^A}{(K \times L)}| =_c |{^A}{K} \times {^A}{L}|$?

Published on 14 Apr 2026 - 6:02

115

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Propositional logic - wrong proof

Published on 13 Apr 2026 - 9:41

List Question

Show for some subsets of $G$ we have subgroups of $(G, \ast)$

Proof of maximum principle of Cauchy integral.

Prove that if $A \subseteq B$ and $A \subseteq C$ then $A \subseteq B \cap C$.

Can $\{(x,y) \mid x^2 + y^2 < 1\}$ can be written as the cartesian product of two subsets of $\mathbb{R}$?

For the ellipse $b^2x^2+a^2y^2=a^2b^2$, show that the equations of the tangent lines of slope $m$ are $y=mx\pm \sqrt{a^2m^2+b^2}.$

Explicit bijection between $\mathbb{N}$ and $\mathbb{N}^2$

Birthday Problem Proof?

Is this proof that Cauchy sequences converge right?

Expected value of a Bernoulli parameter given a sample

Find the flaw in this proof that $1$ is the greatest natural number

Question in linear algebra regarding null spaces and linear maps

Rouché's theorem example verification

Show if $f_x \rightarrow \eta \,\,\,$ and $g_x \rightarrow \zeta$ so $f_x+g_x \rightarrow \eta + \zeta$

How to prove $|{^A}{(K \times L)}| =_c |{^A}{K} \times {^A}{L}|$?

Propositional logic - wrong proof

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