List questions from alternative-proof

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Finite abelian group has a subgroup $H$ with cyclic quotient that "preserves" the order in the quotient.

Published on 26 Mar 2026 - 8:23

211

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How can we not use Muirhead's Inequality for proving the following inequality?

Published on 25 Mar 2026 - 6:12

62

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Is my demonstration for $ \lim_{(x,y)\to(0,0)}(x^2-y^2)\sin(\frac{1}{x^2+y^2})=0$ correct?

Published on 18 Aug 2019 - 15:59

220

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Swedish mathematical competition problem for pre-tertiary students

Published on 26 Mar 2026 - 3:00

64

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Alternate soultion for solving an inequality

Published on 26 Mar 2026 - 1:00

34

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Average distance from centroid of convex figure

Published on 26 Mar 2026 - 10:59

1k

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Convergence Theorems in the extended real numbers

Published on 24 Aug 2019 - 10:16

22

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If $\int g(x)(h(x+a)-h(x)dx=0$ $h\in L^\infty$, $g\in L^1$ then $h$ constant.

Published on 25 Aug 2019 - 6:49

190

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Open mapping theorem calculus proof via Banach-Schauder theorem

Published on 25 Mar 2026 - 23:36

151

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Is there a "geometric reason" for why the gradient of $f(x,y)=\frac{x}{\sqrt{x^2+y^2}}$ is tangent to the unit circle?

Published on 26 Aug 2019 - 5:40

225

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Alternate proof of the isomorphism $T_{(p,q)}(X \times Y) \cong T_p X \times T_q Y$

Published on 28 Aug 2019 - 15:39

236

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Binets second loggamma formula

Published on 27 Mar 2026 - 21:44

109

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Proving Non-algebraic over $\mathbb{Q}$

Published on 29 Aug 2019 - 15:34

94

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Inequality $3\sin^{-1}\left(\frac{\pi^{1/3}}{2^{2/3}}\right)\leq a+b+c$ with some conditions

Published on 25 Mar 2026 - 4:41

29

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What is an easier way to prove that $n$ algebraic structures are distinct (non-isomorphic)?

Published on 31 Aug 2019 - 20:51

List Question

Finite abelian group has a subgroup $H$ with cyclic quotient that "preserves" the order in the quotient.

How can we not use Muirhead's Inequality for proving the following inequality?

Is my demonstration for $ \lim_{(x,y)\to(0,0)}(x^2-y^2)\sin(\frac{1}{x^2+y^2})=0$ correct?

Swedish mathematical competition problem for pre-tertiary students

Alternate soultion for solving an inequality

Average distance from centroid of convex figure

Convergence Theorems in the extended real numbers

If $\int g(x)(h(x+a)-h(x)dx=0$ $h\in L^\infty$, $g\in L^1$ then $h$ constant.

Open mapping theorem calculus proof via Banach-Schauder theorem

Is there a "geometric reason" for why the gradient of $f(x,y)=\frac{x}{\sqrt{x^2+y^2}}$ is tangent to the unit circle?

Alternate proof of the isomorphism $T_{(p,q)}(X \times Y) \cong T_p X \times T_q Y$

Binets second loggamma formula

Proving Non-algebraic over $\mathbb{Q}$

Inequality $3\sin^{-1}\left(\frac{\pi^{1/3}}{2^{2/3}}\right)\leq a+b+c$ with some conditions

What is an easier way to prove that $n$ algebraic structures are distinct (non-isomorphic)?

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