Description: 5 times 3 equals 15. (Contributed by Mario Carneiro, 19-Apr-2015) (Revised by AV, 6-Sep-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | 5t3e15 | |- ( 5 x. 3 ) = ; 1 5 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 5nn0 | |- 5 e. NN0 |
|
2 | 2nn0 | |- 2 e. NN0 |
|
3 | df-3 | |- 3 = ( 2 + 1 ) |
|
4 | 5t2e10 | |- ( 5 x. 2 ) = ; 1 0 |
|
5 | dec10p | |- ( ; 1 0 + 5 ) = ; 1 5 |
|
6 | 1 2 3 4 5 | 4t3lem | |- ( 5 x. 3 ) = ; 1 5 |