Anton Grudkin

Member for 5 years, 11 months
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Saint Petersburg, Russia

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linear-algebra

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$\arctan x=\frac{1}{2}i[\ln(1-ix)-\ln(1+ix)]$

Jun 12, 2016

Derivative of product of matrix by vector

Jun 6, 2018

Sylvester's law of inertia

Jun 8, 2016

We have matrix $A\in M_{n-1\times n}(\mathbb Z)$ so that the sum of entries in each row is zero. Prove that $\det(AA^T)=nk^2.$

Jun 9, 2016

Characterization of the quasi-arithmetic mean

Jun 13, 2019

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$\arctan x=\frac{1}{2}i[\ln(1-ix)-\ln(1+ix)]$

+40

Derivative of product of matrix by vector

+10

Some Questions on proving Forward direction of statements of the form $A$ IFF $(B\wedge C)$

+10

Proof that $\frac{2\theta}{\pi} < \sin \theta < \theta$

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Mar 27, 2017
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How to study math to really understand it and have a healthy lifestyle with free time?

Jun 11, 2011

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Real life applications of Topology

Oct 18, 2011

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A multiplication algorithm found in a book by Paul Erdős: how does it work?

Mar 17, 2017

114

Am I just not smart enough?

Oct 8, 2014

If $a+b=1$ then $a^{4b^2}+b^{4a^2}\leq1$

Mar 7, 2017

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