Metamath Proof Explorer

Theorem 5t3e15

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

Proof

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