Description: 7 - 1 = 6. (Contributed by AV, 6-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | 7m1e6 | |- ( 7 - 1 ) = 6 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 6cn | |- 6 e. CC |
|
2 | ax-1cn | |- 1 e. CC |
|
3 | df-7 | |- 7 = ( 6 + 1 ) |
|
4 | 1 2 3 | mvrraddi | |- ( 7 - 1 ) = 6 |