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HorizonsMaths
  • Member for 11 years, 1 month
  • Last seen more than 6 years ago
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I am a math lover.

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48
How do you prove that $tr(B^{T} A )$ is a inner product?
26
If $xy$ and $x+y$ are both even integers (with $x,y$ integers), then $x$ and $y$ are both even integers
22
$\int_0^{2\pi} \sqrt{1-\cos(x)}\,dx = 4\sqrt{2}$. Why?
20
Fourier transform of even/odd function
17
How to prove that $\cos^2(z)+\sin^2(z)=1$, where $z$ is a complex variable (if it is true)?