Vedran Šego
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 Nov 23 awarded Revival Nov 23 awarded Nice Answer Oct 25 answered ${X_0} \in {\mathbb{C}^n},\forall Y \in {\mathbb{C}^n}\mathop \Rightarrow \limits^?$ there is unitary matrix $U$, such that $UX_0=Y$? Jun 27 revised What is a double folded matrix? Added image, fixed formatting and some typos Jun 27 comment Vector times reverse of vector @RenéG I'd suggest using exceptions to make use of NumPy when it's available and still have it work when it's not available. Jun 26 answered Vector times reverse of vector Jun 3 comment Smith normal form of a polynomial matrix. @tattwamasiamrutam What do you mean? There are "some constants" here (-1, for example). Maybe post a new question asking about what actually troubles you. Jun 3 awarded Necromancer May 22 awarded Yearling May 14 comment If the diagonals of an isosceles trapezoid are perpendicular to each other, prove that the area is $S=H^2$. Look at it as a testament of your progress. ;-) Apr 22 answered $A$ is normal matrix and has distinct eigenvalue, and $AB=0$. why $B$ is normal matrix? Mar 23 comment Applied Linear Algebra Those steps would be better, yes. As for writing formulas on this site, check this out. Mar 22 comment Applied Linear Algebra What do "from $(A^TA^{-1})^{-1}$, $(A^{-1})^{-1}(A^T)^{-1}$" and "Then, $(A)(A^T)^{-1}$" and similar constructs mean? If there is no equality, what is your statement? I think I know what you want to say, but you have to form proper statements in order to have a proper proof. Feb 18 awarded Necromancer Feb 18 revised Norm of a positive definite symmetric matrix by a vector deleted 181 characters in body Feb 10 answered QR Decomposition Interpretation Jan 23 comment Is LU decomposition of matrices efficient for today's standards? This also depends on the pivoting, i.e., if you are considering the LU factiorization with the complete pivoting, with the partial pivoting, or without any pivoting at all. The last one doesn't even exist for all matrices (might not be important for some applications), and the first one is computationally quite expensive. Jan 16 answered Is $A$ diagonalisable if its unitary? Jan 5 comment Diagonalisability of Self-Adjoint Operators for Non-Symmetric Metrics Can you provide a reference for the diagonalizability of self-adjoint operators in symmetric bilinear forms? I'm having a problem with that, so I want to get all the terms right. Dec 9 awarded Caucus