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Anton Grudkin

I study physics and love math.

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  • AntonGrudkin
  • Member for 4 years, 9 months
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  • Last seen Feb 21 at 14:51

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13 $\arctan x=\frac{1}{2}i[\ln(1-ix)-\ln(1+ix)]$ Jun 12 '16
6 Sylvester's law of inertia Jun 8 '16
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 '16
5 How do we get the final formula of the Bernoulli number? Mar 29 '17
5 Derivative of product of matrix by vector Jun 6 '18
5 Characterization of the quasi-arithmetic mean Jun 13 '19
4 Proving Exponential Equations are Equivalent 2 Sep 12 '18
4 $A_{ij}=i-j$, for $i , j = 1, …, n$. What is the rank of $A$? ($n\geq 2$). May 18 '18
4 Functional Equation of iterations Jun 9 '16
4 For an orthogonal matrix $Q$, why does $QQ^T = I$? Jun 19 '16
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