Also fun that your matrix of multiplication is a symmetrical square matrix meaning the transpose is identical :) not sure the significance of it, but it's interesting
Video 1: What Is A Unit Group?
https://cdn.satellite.earth/d81449a118de3985406aac2f6304133c775c7a5ea9bedcbbedff2b8163a0da28.mov
I discuss Unit Groups, and go through the example, using a modulus of 5, I prove the 4 Group axioms under multiplication.
Also fun that your matrix of multiplication is a symmetrical square matrix meaning the transpose is identical :) not sure the significance of it, but it's interesting