Theorem negsval2d

Description: Surreal negation in terms of subtraction. (Contributed by Scott Fenton, 15-Apr-2025)

	Ref	Expression
Hypothesis	negsval2d.1	$$⊢\phi \to A\in \mathrm{No}$$
Assertion	negsval2d	Could not format assertion : No typesetting found for |- ( ph -> ( -us ` A ) = ( 0s -s A ) ) with typecode |-

Proof

Step	Hyp	Ref	Expression
1		negsval2d.1	$$⊢\phi \to A\in \mathrm{No}$$
2		negsval2	Could not format ( A e. No -> ( -us ` A ) = ( 0s -s A ) ) : No typesetting found for |- ( A e. No -> ( -us ` A ) = ( 0s -s A ) ) with typecode |-
3	1 2	syl	Could not format ( ph -> ( -us ` A ) = ( 0s -s A ) ) : No typesetting found for |- ( ph -> ( -us ` A ) = ( 0s -s A ) ) with typecode |-