List questions from examples-counterexamples

Published on 22 Apr 2018 - 22:38

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Superadditive but not convex function

Published on 23 Apr 2018 - 2:45

70

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Why does $\Bbb Z[{1+\sqrt{-19}\over 2}]$ contain $1$?

Published on 23 Apr 2018 - 12:43

93

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Is it true that $nx_n>(n+1)x_{n+1}$?

Published on 23 Apr 2018 - 14:52

103

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Inverse limit of closed intervals which is open?

Published on 25 Mar 2026 - 0:01

93

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Analyzing the convexity of a superadditive function

Published on 24 Apr 2018 - 2:47

277

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Non-example of a lemma on continuity

Published on 24 Apr 2018 - 7:38

46

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Counterexamples between Rings and their polynomial Rings

Published on 24 Apr 2018 - 9:52

287

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A conjecture about $8n+6$

Published on 25 Mar 2026 - 7:15

63

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Non-degenerate Bilinear Forms and Counterexample

Published on 25 Apr 2018 - 4:05

171

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How to find examples of non-unique euclidean division in $\Bbb Z[i]$?

Published on 25 Mar 2026 - 6:24

1.2k

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How to explain to kid why subtraction is not commutative

Published on 25 Mar 2026 - 3:01

124

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An example for integral by substitution where the substitution is not $C^1$

Published on 25 Mar 2026 - 6:04

90

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continues function and uniformly convergent

Published on 28 Apr 2018 - 10:34

4.9k

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What is the use of Null Space?

Published on 29 Apr 2018 - 7:30

List Question

Does a unique global and local minimum imply (strict) convexity?

Superadditive but not convex function

Why does $\Bbb Z[{1+\sqrt{-19}\over 2}]$ contain $1$?

Is it true that $nx_n>(n+1)x_{n+1}$?

Inverse limit of closed intervals which is open?

Analyzing the convexity of a superadditive function

Non-example of a lemma on continuity

Counterexamples between Rings and their polynomial Rings

A conjecture about $8n+6$

Non-degenerate Bilinear Forms and Counterexample

How to find examples of non-unique euclidean division in $\Bbb Z[i]$?

How to explain to kid why subtraction is not commutative

An example for integral by substitution where the substitution is not $C^1$

continues function and uniformly convergent

What is the use of Null Space?

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