Metamath Proof Explorer


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