Theorem subid1i

Description: Identity law for subtraction. (Contributed by NM, 29-May-1999)

	Ref	Expression
Hypothesis	negidi.1	$$⊢A\in ℂ$$
Assertion	subid1i	$$⊢A-0=A$$

Proof

Step	Hyp	Ref	Expression
1		negidi.1	$$⊢A\in ℂ$$
2		subid1	$$⊢A\in ℂ\to A-0=A$$
3	1 2	ax-mp	$$⊢A-0=A$$