# Eric Gregor

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 Dec9 comment Norm of covariance and precision matrices: is there any meaning? Good answer, but I am actually more interested in the precision matrix case. Dec6 comment Maximum entry of small-normed matrix And I was referring to the spectral norm. Dec6 revised Maximum entry of small-normed matrix added 47 characters in body Dec6 asked Maximum entry of small-normed matrix Dec4 comment Are roots of a sparse matrix are sparse? I didn't say anything about diagonal matrices. Dec4 revised Are roots of a sparse matrix are sparse? edited body Dec4 asked Are roots of a sparse matrix are sparse? Dec3 asked Norm of covariance and precision matrices: is there any meaning? Dec3 asked What exactly is a Pettis integral? An example using covariance. Dec3 accepted “max” entry norm inequality? Dec2 accepted Norm inequality question Dec2 revised Norm inequality question added 146 characters in body Dec2 comment Norm inequality question I am not saying that we should have an equality, just some reasonable perturbation of this $\epsilon$, perhaps involving the norm of $T$. Dec2 asked Norm inequality question Dec2 awarded Good Answer Dec2 answered How to improve concentration when beginning to work on a math problem that seems boring? Dec1 comment “max” entry norm inequality? For the 2 norm I think you need a factor of $\sqrt{n}$ in front of it, by the relationship of the 2 norm and infinity norm. Dec1 comment “max” entry norm inequality? @AlgebraicPavel, the spectral norm. But perhaps a more sensible bound is a multiple of the infinity norm? Dec1 revised “max” entry norm inequality? added 47 characters in body Dec1 asked “max” entry norm inequality?