Theorem 5m1e4

Description: 5 - 1 = 4. (Contributed by AV, 6-Sep-2021)

	Ref	Expression
Assertion	5m1e4	⊢ ( 5 − 1 ) = 4

Proof

Step	Hyp	Ref	Expression
1		4cn	⊢ 4 ∈ ℂ
2		ax-1cn	⊢ 1 ∈ ℂ
3		df-5	⊢ 5 = ( 4 + 1 )
4	1 2 3	mvrraddi	⊢ ( 5 − 1 ) = 4