Theorem 1fno

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

	Ref	Expression
Assertion	1fno	⊢ ( 1o × { 2o } ) ∈ No

Proof

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