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 e. CC
2		ax-1cn	|- 1 e. CC
3		df-6	|- 6 = ( 5 + 1 )
4	1 2 3	mvrraddi	|- ( 6 - 1 ) = 5