Description: A number times 2. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | 2timesd.1 | |- ( ph -> A e. CC ) |
|
Assertion | times2d | |- ( ph -> ( A x. 2 ) = ( A + A ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2timesd.1 | |- ( ph -> A e. CC ) |
|
2 | times2 | |- ( A e. CC -> ( A x. 2 ) = ( A + A ) ) |
|
3 | 1 2 | syl | |- ( ph -> ( A x. 2 ) = ( A + A ) ) |