Description: 4 - 1 = 3. (Contributed by AV, 8-Feb-2021) (Proof shortened by AV, 6-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | 4m1e3 | ⊢ ( 4 − 1 ) = 3 |
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 |