ziyuang
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 Apr 14 revised Similarity between $I+N$ and $e^N$ when $N$ is nilpotent added 306 characters in body Apr 14 revised Similarity between $I+N$ and $e^N$ when $N$ is nilpotent added 271 characters in body Oct 17 revised How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? edited title Oct 17 revised How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? edited title Oct 17 revised How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? added 79 characters in body Oct 17 revised How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? added 79 characters in body Sep 25 revised Solution to a system of linear equations in GF(2) added 104 characters in body Sep 25 revised Solution to a system of linear equations in GF(2) added 11 characters in body Sep 25 revised Getting the inverse of a lower/upper triangular matrix added 4 characters in body Jun 26 revised How to use Galerkin method to prove uniqueness of solutions of hyperbolic equations? uniqueness -> existence Jun 25 revised Getting the inverse of a lower/upper triangular matrix added 11 characters in body Jun 25 revised Question in solving $\phi(t)=\phi(2t)+\phi(2t-1)$, $\phi\ne0$ edited tags Jun 23 revised Question in solving $\phi(t)=\phi(2t)+\phi(2t-1)$, $\phi\ne0$ deleted 73 characters in body Jun 23 revised Question in solving $\phi(t)=\phi(2t)+\phi(2t-1)$, $\phi\ne0$ title refined Jun 23 revised Question in solving $\phi(t)=\phi(2t)+\phi(2t-1)$, $\phi\ne0$ Simplify the description Jun 22 revised How to calculate dual frames under constraints? added 4 characters in body; added 3 characters in body Jun 22 revised How to calculate dual frames under constraints? added 89 characters in body Jun 22 revised How to calculate dual frames under constraints? problem 1 is solved and thus removed Jun 22 revised How to calculate dual frames under constraints? added 135 characters in body Jun 22 revised How to use Galerkin method to prove uniqueness of solutions of hyperbolic equations? added 9 characters in body