Theorem 0iscard

Description: 0 is a cardinal number. (Contributed by RP, 1-Oct-2023)

	Ref	Expression
Assertion	0iscard	|- (/) e. ran card

Proof

Step	Hyp	Ref	Expression
1		omssrncard	|- _om C_ ran card
2		peano1	|- (/) e. _om
3	1 2	sselii	|- (/) e. ran card