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Intereting Posts

Can a non-zero vector have zero image under every linear functional?
Necessary condition for positive-semidefiniteness — is it sufficient?
Calculating the determinant gives $(a^2+b^2+c^2+d^2)^2$?
Norm of a Kernel Operator
How to find a smallest group generator
Difference between complete and closed set
Hartshorne proposition II(2.6)
Let $f: V_n \to V_n$ be an endomorphism, prove $\text{dim}(\text{Ker}f \cap \text{Im} f) = r(f) – r(f^2)$
What is the Fourier Transform of $f'(x)/x$
Isomorphism between quotient rings of $\mathbb{Z}$
Convergent series whose Cauchy product diverges
Computing the expectation of conditional variance in 2 ways
How to solve this integral: $ \int_{-1}^{1} \frac{x^4}{a^x+1}dx $?
Give me such a $“3n±Q”$ problem that we do not know a counter-example
If a finite group has $\geq p+1$ Sylow $p$-subgroups (of order $p^n$), then there are $\geq p^{n+1}$ elements in the Sylow $p$-subgroups