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 Nov6 awarded Notable Question Sep1 awarded Famous Question Jul2 awarded Curious Dec7 awarded Popular Question Nov7 awarded Notable Question Aug24 awarded Popular Question Dec10 accepted Determinant of anti-diagonal permutation matrix Dec10 asked Determinant of anti-diagonal permutation matrix Dec7 comment Polar decomposition OMG! That's my huge mistake! I corrected the number in the first matrix! Dec7 revised Polar decomposition deleted 1 characters in body Dec7 comment Polar decomposition That example is from the textbook. Is that wrong? Dec7 asked Polar decomposition Dec3 accepted Does zero vector have zero dimension? Dec3 comment Does zero vector have zero dimension? Yes, but the problem is that I have no idea how to apply the rank-nullity theorem in here. Please state details then I can follow it. Dec3 asked Does zero vector have zero dimension? Dec2 awarded Commentator Dec2 comment Linearly independent and orthogonality I found counter example $x_1=(1, 0), x_2=(2, 1)$, they are linearly independent but not orthogonal. So the inverse is not true, right? Dec2 asked Linearly independent and orthogonality Nov27 comment The existence of second derivative Thanks! I'd like to check to accept your answer but don't know why it doesn't work. Nov27 awarded Custodian