Description: 8 times 7 equals 56. (Contributed by Mario Carneiro, 19-Apr-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | 8t7e56 | |- ( 8 x. 7 ) = ; 5 6 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 8nn0 | |- 8 e. NN0 |
|
2 | 6nn0 | |- 6 e. NN0 |
|
3 | df-7 | |- 7 = ( 6 + 1 ) |
|
4 | 8t6e48 | |- ( 8 x. 6 ) = ; 4 8 |
|
5 | 4nn0 | |- 4 e. NN0 |
|
6 | eqid | |- ; 4 8 = ; 4 8 |
|
7 | 4p1e5 | |- ( 4 + 1 ) = 5 |
|
8 | 8p8e16 | |- ( 8 + 8 ) = ; 1 6 |
|
9 | 5 1 1 6 7 2 8 | decaddci | |- ( ; 4 8 + 8 ) = ; 5 6 |
10 | 1 2 3 4 9 | 4t3lem | |- ( 8 x. 7 ) = ; 5 6 |