Theorem 1iscard

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

	Ref	Expression
Assertion	1iscard	|- 1o e. ran card

Proof

Step	Hyp	Ref	Expression
1		omssrncard	|- _om C_ ran card
2		1onn	|- 1o e. _om
3	1 2	sselii	|- 1o e. ran card