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Apr
24
answered Triangulation of matrices
Apr
13
answered Prove $\{ (x,y) \in [0,1]^2: x-y\in \mathbb{Q}\}$ is measurable.
Apr
13
answered measure of a set invariant by rational translation
Apr
12
asked measure of a set invariant by rational translation
Apr
7
asked Defining integer sum without using infinite sets
Apr
7
asked Integer induction without infinity
Apr
5
asked Small integral representation as $x^2-2y^2$ in Pell's equation
Apr
5
answered BM01 2008/09 Question 5 Sequences Problem
Mar
29
asked Multiplying three factorials with three binomials in polynomial identity
Mar
27
answered Let $(M,d)$ be a compact metric space and $f:M \to M$ such that $d(f(x),f(y)) \ge d(x,y) , \forall x,y \in M$ , then $f$ is isometry?
Mar
25
asked Wilf-Zeilberger context with an extra parameter
Mar
19
answered $\epsilon_{i_1…i_n}\frac{1}{1-a_1a_{i_1}}\cdots\frac{1}{1-a_na_{i_n}} = \frac{\prod_{ i,j, i<j }(a_i-a_j)^2}{\prod_{ i,j. i\leq j}(a_ia_j-1)^2}$?
Mar
19
asked Recognize or interpret this involution : $\frac{\prod_{x\neq i}(1-a_xa_j)}{\prod_{y\neq j}(a_j-a_y)}$
Mar
18
answered Large product of matrices equal zero but not small ones
Mar
17
asked Certain products of mostly diagonal matrices are nonzero
Mar
16
asked Large product of matrices equal zero but not small ones
Mar
16
answered Jointly nilpotent matrices
Mar
15
answered Prove that $g(x)=\frac{\ln(S_n (x))}{\ln(S_{n-1}(x))}$ is increasing in $x$, where $S_{n}(x)=\sum_{m=0}^{n}\frac{x^m}{m!}$
Mar
14
answered Is $BABA$ a symmetric matrix, if $A = A^T$ and $B = B^T$?
Mar
6
asked When is this sum of perfect powers bounded