Theorem 6m1e5

Description: 6 - 1 = 5. (Contributed by AV, 6-Sep-2021)

	Ref	Expression
Assertion	6m1e5	$$⊢6-1=5$$

Proof

Step	Hyp	Ref	Expression
1		5cn	$$⊢5\in ℂ$$
2		ax-1cn	$$⊢1\in ℂ$$
3		df-6	$$⊢6=5+1$$
4	1 2 3	mvrraddi	$$⊢6-1=5$$