Theorem npcan1

Description: Cancellation law for subtraction and addition with 1. (Contributed by Alexander van der Vekens, 5-Oct-2018)

	Ref	Expression
Assertion	npcan1	$$⊢A\in ℂ\to A-1+1=A$$

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	npcand	$$⊢A\in ℂ\to A-1+1=A$$