Question

Prove Triangle Inequality for Two Special Cases

score 269 · Answer 1 · 2026-04-16 09:12:10

269

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Prove Triangle Inequality for Two Special Cases

Published on 16 Apr 2026 - 9:12

score 1.2k · Answer 2 · 2026-04-12 08:01:19

1.2k

Views

Is every subset of $\mathbb{R}$ Lebesgue measurable?

Published on 12 Apr 2026 - 8:01

score 1k · Answer 3 · 2026-04-16 07:50:34

1k

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$[G:H]<\infty$. Show that there exists a normal subgroup $N$ of $G$ such that $N \subset H$, $[G:N]<\infty$

Published on 16 Apr 2026 - 7:50

score 90 · Answer 4 · 2026-04-14 03:48:57

90

Views

Fibonacci inequality proved by induction.

Published on 14 Apr 2026 - 3:48

score 288 · Answer 5 · 2026-04-25 20:52:46

Suppose $M_1, \dots M_k$ are smooth manifolds, then each of the projection maps $\pi_i : M_1 \times \dots \times M_k \to M_i$ is a submersion

score 351 · Answer 6 · 2026-04-18 23:20:31

351

Views

How to prove that $a(1-a^N)/(1-a)<N$?

Published on 18 Apr 2026 - 23:20

score 106 · Answer 7 · 2026-04-14 07:58:51

106

Views

Finding out the value of $\angle DQC$ in a trapezium $ABQD$ where $\angle DCB$ = 30$^\circ$

Published on 14 Apr 2026 - 7:58

score 3.4k · Answer 8 · 2026-04-14 22:53:26

3.4k

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Is the uniqueness of the additive neutral element sufficient to prove x+z=x implies z=0?

Published on 14 Apr 2026 - 22:53

score 59 · Answer 9 · 2026-04-15 20:03:04

59

Views

Use the principle of mathematical induction to prove [(1/2)+(1/2)+(1/3)+. . . (1/n)] ≤ (n/2)+1 for all n ϵ z+

Published on 15 Apr 2026 - 20:03

score 49 · Answer 10 · 2026-04-16 04:36:10

49

Views

Bounding $\int (f')^2 dx$ from below

Published on 16 Apr 2026 - 4:36

score 34 · Answer 11 · 2026-04-10 02:20:21

34

Views

Understanding the solution of a question about sufficient statistics

Published on 10 Apr 2026 - 2:20

score 160 · Answer 12 · 2026-04-14 12:14:57

160

Views

Is my proof of $x^n-y^n = \ldots$ correct?

Published on 14 Apr 2026 - 12:14

score 74 · Answer 13 · 2026-04-29 04:05:29

74

Views

Is my proof that this limit does not exist correct?

Published on 29 Apr 2026 - 4:05

score 1.3k · Answer 14 · 2026-04-16 02:57:15

1.3k

Views

Let $f:[a,b]\to\Bbb{R}$ be a bounded function which is continuous except at a point $x_0\in [a,b]$. Then, $f$ is Riemann integrable over $[a,b]$.

Published on 16 Apr 2026 - 2:57

score 66 · Answer 15 · 2026-04-11 17:46:52

66

Views

Is my proof correct

Published on 11 Apr 2026 - 17:46

List Question

Prove Triangle Inequality for Two Special Cases

Is every subset of $\mathbb{R}$ Lebesgue measurable?

$[G:H]<\infty$. Show that there exists a normal subgroup $N$ of $G$ such that $N \subset H$, $[G:N]<\infty$

Fibonacci inequality proved by induction.

Suppose $M_1, \dots M_k$ are smooth manifolds, then each of the projection maps $\pi_i : M_1 \times \dots \times M_k \to M_i$ is a submersion

How to prove that $a(1-a^N)/(1-a)<N$?

Finding out the value of $\angle DQC$ in a trapezium $ABQD$ where $\angle DCB$ = 30$^\circ$

Is the uniqueness of the additive neutral element sufficient to prove x+z=x implies z=0?

Use the principle of mathematical induction to prove [(1/2)+(1/2)+(1/3)+. . . (1/n)] ≤ (n/2)+1 for all n ϵ z+

Bounding $\int (f')^2 dx$ from below

Understanding the solution of a question about sufficient statistics

Is my proof of $x^n-y^n = \ldots$ correct?

Is my proof that this limit does not exist correct?

Let $f:[a,b]\to\Bbb{R}$ be a bounded function which is continuous except at a point $x_0\in [a,b]$. Then, $f$ is Riemann integrable over $[a,b]$.

Is my proof correct

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