What is the identity matrix for subtraction?

1 Answer
May 28, 2015

Assuming we're talking about 2x2 matrices, the identity matrix for subtraction is the same as that for addition, namely:

#(0, 0)#
#(0, 0)#

The identity matrix for multiplication and division is:

#(1, 0)#
#(0, 1)#

There are analogous matrices of larger size, consisting of all #0#'s or all #0#'s except for a diagonal of #1#'s.