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 Mar 2 awarded Popular Question Jan 30 awarded Nice Question Jan 2 comment Jacobi theta with a matrix Do you know if the Riemann theta has a similar property? mathworld.wolfram.com/JacobisImaginaryTransformation.html Dec 24 awarded Benefactor Dec 24 accepted Jacobi theta with a matrix Dec 24 comment Jacobi theta with a matrix This is along the lines of what I was looking for, thanks. Dec 22 comment Jacobi theta with a matrix The eigenvalues of $A$ are necessarily real, but not positive definite, this ruins its applicability doesn't it? Dec 21 revised Jacobi theta with a matrix wrote some explict sums for clairity. Dec 21 comment Jacobi theta with a matrix @Startwearingpurple Exactly. It is a sum over each of the $q$s. I guess this is causing trouble. I'll try and be more explicit, thanks. Dec 13 revised Jacobi theta with a matrix added a tag Dec 13 revised Jacobi theta with a matrix edited body Dec 13 comment Jacobi theta with a matrix @MarianoSuárez-Alvarez I think so, is it misleading that I doubled up on $i$? I can make it a different letter. Dec 13 asked Jacobi theta with a matrix Feb 10 comment Singular Value Decomposition for Continuous Variables Thanks for the answer, it's interesting. I have a professor in my dept who works with wavelets and should ask him about this construction. Feb 10 comment Singular Value Decomposition for Continuous Variables Thank you both for your comments! I will look into this idea, as it's a natural extension from the matrix definition. Feb 7 comment If yesterday were tomorrow, then today would be Friday. @user3440448 the answer is identical. If tomorrow were saturday, then today would be friday. In other words, today is sunday. Feb 3 answered If yesterday were tomorrow, then today would be Friday. Feb 2 awarded Promoter Feb 2 revised Singular Value Decomposition for Continuous Variables added 2 characters in body Oct 5 awarded Popular Question