Theorem mulslidd

Description: Surreal one is a left identity element for multiplication. (Contributed by Scott Fenton, 14-Mar-2025)

	Ref	Expression
Hypothesis	mulslidd.1	|- ( ph -> A e. No )
Assertion	mulslidd	|- ( ph -> ( 1s x.s A ) = A )

Proof

Step	Hyp	Ref	Expression
1		mulslidd.1	|- ( ph -> A e. No )
2		mulslid	|- ( A e. No -> ( 1s x.s A ) = A )
3	1 2	syl	|- ( ph -> ( 1s x.s A ) = A )