Theorem 4fno

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

	Ref	Expression
Assertion	4fno	$$⊢4_{𝑜}\times \left\{2_{𝑜}\right\}\in \mathrm{No}$$

Proof

Step	Hyp	Ref	Expression
1		4on	$$⊢4_{𝑜}\in \mathrm{On}$$
2	1	onnoxpi	$$⊢4_{𝑜}\times \left\{2_{𝑜}\right\}\in \mathrm{No}$$