Theorem addsid1d

Description: Surreal addition to zero is identity. Part of Theorem 3 of Conway p. 17. (Contributed by Scott Fenton, 20-Aug-2024)

	Ref	Expression
Hypothesis	addsid1d.1	$$⊢\phi \to A\in \mathrm{No}$$
Assertion	addsid1d	Could not format assertion : No typesetting found for |- ( ph -> ( A +s 0s ) = A ) with typecode |-

Proof

Step	Hyp	Ref	Expression
1		addsid1d.1	$$⊢\phi \to A\in \mathrm{No}$$
2		addsid1	Could not format ( A e. No -> ( A +s 0s ) = A ) : No typesetting found for |- ( A e. No -> ( A +s 0s ) = A ) with typecode |-
3	1 2	syl	Could not format ( ph -> ( A +s 0s ) = A ) : No typesetting found for |- ( ph -> ( A +s 0s ) = A ) with typecode |-