Question

Sequence of Nested Projections in an arbitrary Normed Linear Space Converges to the Identity

score 198 · Answer 1 · 2026-04-15 08:05:27

198

Views

Sequence of Nested Projections in an arbitrary Normed Linear Space Converges to the Identity

Published on 15 Apr 2026 - 8:05

score 93 · Answer 2 · 2026-04-15 07:24:31

93

Views

Asymptotic behavior and a function less than $x$

Published on 15 Apr 2026 - 7:24

score 182 · Answer 3 · 2026-04-12 04:36:42

182

Views

Induction proof with Stirling numbers of the second kind

Published on 12 Apr 2026 - 4:36

score 87 · Answer 4 · 2026-04-11 19:14:15

87

Views

Euclidean Geometry, Question involving reflection, Homothety.

Published on 11 Apr 2026 - 19:14

score 246 · Answer 5 · 2026-04-12 05:52:33

246

Views

An immediate alternative to a trigonometry problem (high school)

Published on 12 Apr 2026 - 5:52

score 151 · Answer 6 · 2026-04-17 05:03:52

151

Views

If $A_n=\{(n+1)k:k\in\mathbb{N}\}$ determine the sets $\bigcup\{A_n:n\in\mathbb{N}\}$ and $\bigcap\{A_{n}:n\in\mathbb{N}\}$?

Published on 17 Apr 2026 - 5:03

score 80 · Answer 7 · 2026-04-16 00:29:54

80

Views

Prove $f(x)=x/\sqrt{x^2+1}$ for $f:\mathbb{R}\to(-1,1)$ is a bijection.

Published on 16 Apr 2026 - 0:29

score 31 · Answer 8 · 2026-04-14 20:03:34

31

Views

How to prove $A\subseteq B \wedge C:=\lbrace x:x\in A\wedge x\in B\rbrace \longrightarrow C=A$

Published on 14 Apr 2026 - 20:03

score 74 · Answer 9 · 2026-04-16 11:09:25

74

Views

Weaken Ramsey's Number $R(4,4)$ from $18$ to $20$ , for a simpler proof.

Published on 16 Apr 2026 - 11:09

score 676 · Answer 10 · 2026-04-14 12:07:07

676

Views

Prove $f(x)=\cos(x)$, for $f:\mathbb{R}\to[-1,1]$, is onto $[-1,1]$ but not one-to-one?

Published on 14 Apr 2026 - 12:07

score 605 · Answer 11 · 2026-04-12 02:48:39

605

Views

Prove the set of positive even integers is well-ordered using the well-ordering principle?

Published on 12 Apr 2026 - 2:48

score 67 · Answer 12 · 2026-04-10 10:06:29

67

Views

Attempting to simplify a proof that all subgroups of $\mathbb{Z}^n$ are finitely generated.

Published on 10 Apr 2026 - 10:06

score 130 · Answer 13 · 2026-04-14 16:29:39

130

Views

Prove the set of all positive rational numbers in the form of $a/2$ for $a\in\mathbb{N}$ is well-ordered.

Published on 14 Apr 2026 - 16:29

score 692 · Answer 14 · 2026-04-15 18:54:13

692

Views

Area under $x^{-x}$ over its real domain. What is another non-integral form of $\int_{\Bbb R^+}x^{-x}dx$?

Published on 15 Apr 2026 - 18:54

score 172 · Answer 15 · 2026-04-14 12:23:18

172

Views

What is the clearest way of proving of $[x]+[x+1/2]=[2x]$?

Published on 14 Apr 2026 - 12:23

List Question

Sequence of Nested Projections in an arbitrary Normed Linear Space Converges to the Identity

Asymptotic behavior and a function less than $x$

Induction proof with Stirling numbers of the second kind

Euclidean Geometry, Question involving reflection, Homothety.

An immediate alternative to a trigonometry problem (high school)

If $A_n=\{(n+1)k:k\in\mathbb{N}\}$ determine the sets $\bigcup\{A_n:n\in\mathbb{N}\}$ and $\bigcap\{A_{n}:n\in\mathbb{N}\}$?

Prove $f(x)=x/\sqrt{x^2+1}$ for $f:\mathbb{R}\to(-1,1)$ is a bijection.

How to prove $A\subseteq B \wedge C:=\lbrace x:x\in A\wedge x\in B\rbrace \longrightarrow C=A$

Weaken Ramsey's Number $R(4,4)$ from $18$ to $20$ , for a simpler proof.

Prove $f(x)=\cos(x)$, for $f:\mathbb{R}\to[-1,1]$, is onto $[-1,1]$ but not one-to-one?

Prove the set of positive even integers is well-ordered using the well-ordering principle?

Attempting to simplify a proof that all subgroups of $\mathbb{Z}^n$ are finitely generated.

Prove the set of all positive rational numbers in the form of $a/2$ for $a\in\mathbb{N}$ is well-ordered.

Area under $x^{-x}$ over its real domain. What is another non-integral form of $\int_{\Bbb R^+}x^{-x}dx$?

What is the clearest way of proving of $[x]+[x+1/2]=[2x]$?

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