List questions from alternative-proof

Published on 01 Apr 2026 - 2:29

99

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The limit of $f(x,y)= \dfrac {x^2 y}{x^2 + y^2}$ as $ (x,y) \to (0,0)$

Published on 04 Jul 2016 - 16:01

306

Views

Hard proof concerning the periodicity of trigonometrical functions. Is that a challenge or just trivial

Published on 01 Apr 2026 - 1:06

38.7k

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Why Markov matrices always have 1 as an eigenvalue

Published on 03 Apr 2026 - 11:15

9.2k

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Is there an idempotent element in a finite semigroup?

Published on 25 Mar 2026 - 3:01

417

Views

Proving or Disproving the Sum in a Set

Published on 08 Apr 2013 - 22:23

325

Views

Largest element of the set $\{ \sin{1}, \sin{2}, \sin{3}\}$

Published on 10 Apr 2013 - 23:09

5.1k

Views

Any group of order $2p$ has a subgroup of order $p~$($p$ being a prime)

Published on 26 Mar 2026 - 22:16

96

Views

How do I show that $N\leqslant Z(G)$ without using Sylow theorems?

Published on 26 Mar 2026 - 22:13

835

Views

Writing a group element as $ghg^{-1} h^{-1}$ and as $g^2 h^2$

Published on 18 Apr 2013 - 14:13

1.7k

Views

Group theory - proof check about index and quotient group

Published on 26 Apr 2013 - 15:58

1.4k

Views

Can $\lim_{h\to 0}\frac{b^h - 1}{h}$ be solved without circular reasoning?

Published on 27 Apr 2013 - 6:26

20.2k

Views

Extreme Value Theorem proof help

Published on 29 Apr 2013 - 20:13

1.9k

Views

Why matrix representation of convolution cannot explain the convolution theorem?

Published on 24 Feb 2026 - 7:02

3.4k

Views

Proof for Singularity of Additive Identity

Published on 01 May 2013 - 17:59

List Question

Full binary tree proof validity: Number of leaves $L$ and number of nodes $N$

The limit of $f(x,y)= \dfrac {x^2 y}{x^2 + y^2}$ as $ (x,y) \to (0,0)$

Hard proof concerning the periodicity of trigonometrical functions. Is that a challenge or just trivial

Why Markov matrices always have 1 as an eigenvalue

Is there an idempotent element in a finite semigroup?

Proving or Disproving the Sum in a Set

Largest element of the set $\{ \sin{1}, \sin{2}, \sin{3}\}$

Any group of order $2p$ has a subgroup of order $p~$($p$ being a prime)

How do I show that $N\leqslant Z(G)$ without using Sylow theorems?

Writing a group element as $ghg^{-1} h^{-1}$ and as $g^2 h^2$

Group theory - proof check about index and quotient group

Can $\lim_{h\to 0}\frac{b^h - 1}{h}$ be solved without circular reasoning?

Extreme Value Theorem proof help

Why matrix representation of convolution cannot explain the convolution theorem?

Proof for Singularity of Additive Identity

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