Theorem mulid1d

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

	Ref	Expression
Hypothesis	addcld.1	$$⊢\phi \to A\in ℂ$$
Assertion	mulid1d	$$⊢\phi \to A\cdot 1=A$$

Proof

Step	Hyp	Ref	Expression
1		addcld.1	$$⊢\phi \to A\in ℂ$$
2		mulid1	$$⊢A\in ℂ\to A\cdot 1=A$$
3	1 2	syl	$$⊢\phi \to A\cdot 1=A$$