Suppose $A$ and $B$ are sets and $A$ is finite. Prove that $A \sim B$ iff $B$ is also finite and $|A| = |B|$.
Notes on notation:
$A \sim B$ indicates that $A$ is equinumerous with $B$.
Suppose $A$ and $B$ are sets and $A$ is finite. Prove that $A \sim B$ iff $B$ is also finite and $|A| = |B|$.
Notes on notation:
$A \sim B$ indicates that $A$ is equinumerous with $B$.