Theorem renegi

Description: Real part of negative. (Contributed by NM, 2-Aug-1999)

	Ref	Expression
Hypothesis	recl.1	$$⊢A\in ℂ$$
Assertion	renegi	$$⊢\Re \left(-A\right)=-\Re \left(A\right)$$

Proof

Step	Hyp	Ref	Expression
1		recl.1	$$⊢A\in ℂ$$
2		reneg	$$⊢A\in ℂ\to \Re \left(-A\right)=-\Re \left(A\right)$$
3	1 2	ax-mp	$$⊢\Re \left(-A\right)=-\Re \left(A\right)$$