Theorem n0zsd

Description: A non-negative surreal integer is a surreal integer. (Contributed by Scott Fenton, 26-May-2025)

	Ref	Expression
Hypothesis	n0zsd.1	|- ( ph -> A e. NN0_s )
Assertion	n0zsd	|- ( ph -> A e. ZZ_s )

Proof

Step	Hyp	Ref	Expression
1		n0zsd.1	|- ( ph -> A e. NN0_s )
2		n0zs	|- ( A e. NN0_s -> A e. ZZ_s )
3	1 2	syl	|- ( ph -> A e. ZZ_s )