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https://en.wikipedia.org/wiki/Matrix_(mathematics)
http://www.maths.manchester.ac.uk/~higham/fm/OT104HighamChapter5.pdf
https://www.cut-the-knot.org/Curriculum/Algebra/SwitchingSigns.shtml
https://www.youtube.com/watch?v=21LWuY8i6Hw
https://www.youtube.com/watch?v=V3e7m-qFDFU
https://www.youtube.com/watch?v=Ympm-AxmJ14
https://www.mathworks.com/help/matlab/ref/sign.html
https://stackoverflow.com/questions/36215393/how-to-put-sign-in-matrix?rq=1
https://math.stackexchange.com/questions/519151/interchanging-rows-of-matrix-changes-sign-of-determinants
https://tex.stackexchange.com/questions/311018/aligning-the-minus-sign-in-a-matrix/311020
https://www.khanacademy.org/math/linear-algebra/matrix-transformations/matrix-transpose/v/linear-algebra-transpose-of-a-matrix
https://www.khanacademy.org/math/precalculus/precalc-matrices/multiplying-matrices-by-matrices/v/multiplying-a-matrix-by-a-matrix
http://www.mathcentre.ac.uk/resources/uploaded/sigma-matrices9-2009-1.pdf