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 Apr21 answered Proving or disproving $c-d|p(c)-p(d)$ where $p$ is a polynomial. Dec29 awarded Nice Answer Dec20 awarded Constituent Dec16 awarded Caucus Nov11 comment “Number of zeroes of $f \leq \deg f$” used in a proof. Gern geschehen! Nov11 comment “Number of zeroes of $f \leq \deg f$” used in a proof. Non-zero polynomials certainly are. Nov11 answered “Number of zeroes of $f \leq \deg f$” used in a proof. Nov9 comment If $A,B$ are commuting diagonalizable complex matrices , then $A,B$ have a common eigen-basis ? First prove the following: If $AB = BA$, then each eigenspace of $A$ is preserved by $B$. Apr16 comment Construct matrix of ones and zeros based on sequences yes, your comment to the question is not off the mark - indeed such a matrix need not always exist. On the other hand, the Gale-Ryser theorem gives a necessary and sufficient condition for its existence for general sequences. Apr16 comment Construct matrix of ones and zeros based on sequences If they don't sum up to the same constant, then the answer is somewhat trivially no, because the sums of both sequences will be the total number of $1$'s in the matrix. Apr16 comment Construct matrix of ones and zeros based on sequences Then I am missing something. Apr16 awarded Organizer Apr16 revised Construct matrix of ones and zeros based on sequences Added a couple of tags Apr16 suggested approved edit on Construct matrix of ones and zeros based on sequences Apr16 answered Construct matrix of ones and zeros based on sequences Mar15 comment If $AB=BA$ then they are diagonal This is clearly false, take $A$ arbitrary and $B=A$. There is however, a statement that if $A$ and $B$ are diagonalizable and $AB=BA$ then $A$ and $B$ are simultaneously diagonalizable. Feb20 comment Suppose H and K are subgroups of a group G. If |H| = 12 and |K| = 35, what is |H intersection K|? What can the cardinality of $H\cap K$ be? Feb18 awarded Critic Feb17 comment Why is $\text{Hom}(V,W)$ the same thing as $V^* \otimes W$? Have you thought about why it is $V^*\otimes W$ and not $V\otimes W$? Feb14 comment Calculating centre of rotation given point coordinates at different positions It's called "Problems and Solutions" in the Mathematics Newsletter of the Ramanujan Mathematical Society. If you send me e-mail address (mine can be found at imsc.res.in/~amri, I can get in touch with you).