6120a Discrete Mathematics And Proof For Computer Science Fix

add compare , contrast and reflective statements.

A set $A$ is a subset of a set $B$, denoted by $A \subseteq B$, if every element of $A$ is also an element of $B$. add compare , contrast and reflective statements

A proposition is a statement that can be either true or false. denoted by $A \subseteq B$