Mathematics
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Anton Grudkin
  • Member for 5 years, 11 months
  • Last seen more than a week ago
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I study physics and love math.

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All Questions Answers
Score Newest
answer
15
$\arctan x=\frac{1}{2}i[\ln(1-ix)-\ln(1+ix)]$
Jun 12, 2016
answer
10
Derivative of product of matrix by vector
Jun 6, 2018
answer
7
Sylvester's law of inertia
Jun 8, 2016
answer
5
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
answer
5
How do we get the final formula of the Bernoulli number?
Mar 29, 2017
answer
5
Characterization of the quasi-arithmetic mean
Jun 13, 2019
answer
4
Proving Exponential Equations are Equivalent 2
Sep 12, 2018
answer
4
$A_{ij}=i-j$, for $i , j = 1, ..., n$. What is the rank of $A$? ($n\geq 2$).
May 18, 2018
answer
4
Functional Equation of iterations
Jun 9, 2016
answer
4
For an orthogonal matrix $Q$, why does $QQ^T = I$?
Jun 19, 2016

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