Theorem subid1i

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

	Ref	Expression
Hypothesis	negidi.1	⊢ 𝐴 ∈ ℂ
Assertion	subid1i	⊢ ( 𝐴 − 0 ) = 𝐴

Proof

Step	Hyp	Ref	Expression
1		negidi.1	⊢ 𝐴 ∈ ℂ
2		subid1	⊢ ( 𝐴 ∈ ℂ → ( 𝐴 − 0 ) = 𝐴 )
3	1 2	ax-mp	⊢ ( 𝐴 − 0 ) = 𝐴