Theorem mullidi

Description: Identity law for multiplication. (Contributed by NM, 14-Feb-1995)

	Ref	Expression
Hypothesis	axi.1	$$⊢A\in ℂ$$
Assertion	mullidi	$$⊢1A=A$$

Proof

Step	Hyp	Ref	Expression
1		axi.1	$$⊢A\in ℂ$$
2		mullid	$$⊢A\in ℂ\to 1A=A$$
3	1 2	ax-mp	$$⊢1A=A$$