Theorem pncan1

Description: Cancellation law for addition and subtraction with 1. (Contributed by Alexander van der Vekens, 3-Oct-2018)

	Ref	Expression
Assertion	pncan1	$$⊢A\in ℂ\to A+1-1=A$$

Proof

Step	Hyp	Ref	Expression
1		id	$$⊢A\in ℂ\to A\in ℂ$$
2		1cnd	$$⊢A\in ℂ\to 1\in ℂ$$
3	1 2	pncand	$$⊢A\in ℂ\to A+1-1=A$$