In the previous post I looked at binary relations on finite sets; in this post I’m going to prove a…
There are a lot of times when I encounter an unordered set but then end up working with a matrix…
$\newcommand{\X}{\mathscr X}$$\newcommand{\Y}{\mathscr Y}$$\newcommand{\pow}{\mathcal P}$Let $f : \X \to \Y$ be a function between non-empty but otherwise arbitrary sets $\X$ and…