Description: 5 - 1 = 4. (Contributed by AV, 6-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | 5m1e4 | |- ( 5 - 1 ) = 4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 4cn | |- 4 e. CC |
|
2 | ax-1cn | |- 1 e. CC |
|
3 | df-5 | |- 5 = ( 4 + 1 ) |
|
4 | 1 2 3 | mvrraddi | |- ( 5 - 1 ) = 4 |