List questions from examples-counterexamples

Published on 26 Mar 2026 - 7:38

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Does every inner product space have an orthonormal basis?

Published on 29 Dec 2014 - 16:15

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about the closure of by pointwise convergence of sequences.

Published on 29 Dec 2014 - 23:04

277

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Non exact sequence of quotients by torsion subgroups

Published on 26 Mar 2026 - 17:32

91

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Example where $\lim\limits_{m\rightarrow\infty} \int_E f_m =0$ and $f_m(x) \not\rightarrow 0$

Published on 02 Jan 2015 - 20:32

203

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"zigzag comb" contractible without using weak deformation retraction (Hatcher 0.6(b))

Published on 02 Oct 2019 - 7:54

319

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Does there exists a function $f$ such that $f \circ f (x)= -x$

Published on 03 Oct 2019 - 2:24

54

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relation set theory

Published on 30 Mar 2026 - 5:10

150

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Bott's Formula and Blow up

Published on 25 Mar 2026 - 9:35

105

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Let $V$ be a finite dimensional Vector Space and let $A$ $B$ and $C$ be sub spaces of $V$ Which of the following is/are true?

Published on 05 Oct 2019 - 12:03

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Isometry of a metric space example

Published on 25 Mar 2026 - 22:23

191

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Valuation ring which is not a DVR but has finite residue field

Published on 25 Mar 2026 - 11:13

427

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Primality test for numbers of the form $N=2 \cdot 6^n-1$

Published on 26 Mar 2026 - 11:04

451

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An inequality for polynomials with positives coefficients

Published on 12 Mar 2026 - 21:28

410

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Looking for counter example where monotone convergence sequence not hold for a decreasing sequence

Published on 13 Oct 2019 - 22:31

List Question

A continuous function on $[0,1]$ not of bounded variation

Does every inner product space have an orthonormal basis?

about the closure of by pointwise convergence of sequences.

Non exact sequence of quotients by torsion subgroups

Example where $\lim\limits_{m\rightarrow\infty} \int_E f_m =0$ and $f_m(x) \not\rightarrow 0$

"zigzag comb" contractible without using weak deformation retraction (Hatcher 0.6(b))

Does there exists a function $f$ such that $f \circ f (x)= -x$

relation set theory

Bott's Formula and Blow up

Let $V$ be a finite dimensional Vector Space and let $A$ $B$ and $C$ be sub spaces of $V$ Which of the following is/are true?

Isometry of a metric space example

Valuation ring which is not a DVR but has finite residue field

Primality test for numbers of the form $N=2 \cdot 6^n-1$

An inequality for polynomials with positives coefficients

Looking for counter example where monotone convergence sequence not hold for a decreasing sequence

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