Theorem subid1d

Description: Identity law for subtraction. (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypothesis	negidd.1	$$⊢\phi \to A\in ℂ$$
Assertion	subid1d	$$⊢\phi \to A-0=A$$

Proof

Step	Hyp	Ref	Expression
1		negidd.1	$$⊢\phi \to A\in ℂ$$
2		subid1	$$⊢A\in ℂ\to A-0=A$$
3	1 2	syl	$$⊢\phi \to A-0=A$$