Description: 4 times 3 equals 12. (Contributed by Mario Carneiro, 19-Apr-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | 4t3e12 | |- ( 4 x. 3 ) = ; 1 2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 4nn0 | |- 4 e. NN0 |
|
2 | 2nn0 | |- 2 e. NN0 |
|
3 | df-3 | |- 3 = ( 2 + 1 ) |
|
4 | 4t2e8 | |- ( 4 x. 2 ) = 8 |
|
5 | 8p4e12 | |- ( 8 + 4 ) = ; 1 2 |
|
6 | 1 2 3 4 5 | 4t3lem | |- ( 4 x. 3 ) = ; 1 2 |