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Looking for an intuitive explanation why the row rank is equal to the column rank for a matrix
Norm of an inverse operator: $\|T^{-1}\|=\|T\|^{-1}$?
If $0<a<1, 0<b<1$, $a+b=1$, then prove that $a^{2b}+ b^{2a} \le 1$
Proof of the identity $2^n = \sum\limits_{k=0}^n 2^{-k} \binom{n+k}{k}$
Help Converting to First Logic Order Representation
How do you describe your mathematical research in layman's terms?
Starting digits of $2^n$.
Various kinds of derivatives
Difference between “$G$ acts on $A$” and “G is a permutation group on $A$ (i.e. $G\leq S_A$)”
Expressing the determinant of a sum of two matrices?
Defining a Perplexing Two-Dimensional Sequence Explicitly
Let $p$ be an odd prime number. How many $p$-element subsets of $\{1,2,3,4, \ldots, 2p\}$ have sums divisible by $p$?
Proving that the smooth, compactly supported functions are dense in $L^2$.
If $a^2+b^2 = c^2 + \sqrt{3}$, find value of $\angle C$.
Does the series $\sum \sin^{(n)}(1)$ converge, where $\sin^{(n)}$ denotes the $n$-fold composition of $\sin$?