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Metamath Proof Explorer

Theorem 4m1e3

Description: 4 - 1 = 3. (Contributed by AV, 8-Feb-2021) (Proof shortened by AV, 6-Sep-2021)

Ref Expression
Assertion 4m1e3 ( 4 − 1 ) = 3

Proof

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