Theorem 4fno

Description: Ordinal four maps to a surreal number. (Contributed by RP, 21-Sep-2023)

	Ref	Expression
Assertion	4fno	⊢ ( 4o × { 2o } ) ∈ No

Proof

Step	Hyp	Ref	Expression
1		4on	⊢ 4o ∈ On
2	1	onnoxpi	⊢ ( 4o × { 2o } ) ∈ No