List questions from proof-explanation

Published on 11 Apr 2026 - 3:05

90

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Problems in understanding equivalent definitions of type.

Published on 11 Apr 2026 - 10:29

39

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Why does $\sum_{i=1}^n a = (n+1)a$

Published on 16 Apr 2026 - 0:56

162

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Existence of subgroups of index $2$

Published on 15 Apr 2026 - 11:09

77

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Proof of existence of Fraissé limit (Hodges)

Published on 12 Apr 2026 - 17:41

127

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${\log}_{a}{x}\neq {\int}^{x}_{1}{\frac{1}{t}}dt$

Published on 17 Apr 2026 - 11:43

563

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Some doubts in a part of the proof of Backwards Martingale Convergence Theorem (Jacod-Protter)

Published on 25 Mar 2026 - 19:06

271

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Explain a counter-example showing that Kolmogorov-Chentsov Theorem cannot be relaxed.

Published on 13 Apr 2026 - 3:12

120

Views

Can anyone help me to understand how this upper and lower bound for the binomial coefficient are derived?

Published on 18 Apr 2026 - 2:20

74

Views

Proof gone wrong: why don't all domains have characteristic $0$?

Published on 18 Apr 2026 - 1:28

114

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Derivation of Inequality in Fundamental Theorem of Algebra

Published on 10 Apr 2026 - 1:21

52

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Let $G$ be a non-nilpotent group where all the non-normal abelian subgroups of $G$ are cyclic. Then $G$ has cyclic center.

Published on 16 Apr 2026 - 6:29

151

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On the proof of the unsolvability of the word problem in semigroups

Published on 26 Mar 2026 - 10:45

354

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$f(z^n)=f(0)+g(z)^n$ in a neighborhood of $0$

Published on 16 Apr 2026 - 11:47

266

Views

How do I prove the floor identity $⌊x + n⌋ = ⌊x⌋ + n$ in a more precise way?

Published on 11 Apr 2026 - 7:52

List Question

An application of Uniform Boundedness Theorem

Problems in understanding equivalent definitions of type.

Why does $\sum_{i=1}^n a = (n+1)a$

Existence of subgroups of index $2$

Proof of existence of Fraissé limit (Hodges)

${\log}_{a}{x}\neq {\int}^{x}_{1}{\frac{1}{t}}dt$

Some doubts in a part of the proof of Backwards Martingale Convergence Theorem (Jacod-Protter)

Explain a counter-example showing that Kolmogorov-Chentsov Theorem cannot be relaxed.

Can anyone help me to understand how this upper and lower bound for the binomial coefficient are derived?

Proof gone wrong: why don't all domains have characteristic $0$?

Derivation of Inequality in Fundamental Theorem of Algebra

Let $G$ be a non-nilpotent group where all the non-normal abelian subgroups of $G$ are cyclic. Then $G$ has cyclic center.

On the proof of the unsolvability of the word problem in semigroups

$f(z^n)=f(0)+g(z)^n$ in a neighborhood of $0$

How do I prove the floor identity $⌊x + n⌋ = ⌊x⌋ + n$ in a more precise way?

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