this post was submitted on 15 Mar 2025
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Could one of you scholars please explain the joke for us smoothbrains who don't get it? All I see is a boolean matrix, and I'm not even sure that is correct.
That matrix of zeros with one in diagonal is called the matrix of identity.
It is famous because when doing multiplication on matrix or vector, it acts likes 1 on "normal" number:
x times 1 is x.
anyMatrix times Identity is anyMatrix.
Wouldn't you need to put
anyMatrixfirst, since matrix multiplication isn't commutative?Huh? Identity times anyMatrix is also anyMatrix. The matrix just has to have the right dimensions