Description: Additive operation of a subring algebra. (Contributed by Stefan O'Rear, 27-Nov-2014) (Revised by Mario Carneiro, 4-Oct-2015) (Revised by Thierry Arnoux, 16-Jun-2019)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | srapart.a | |- ( ph -> A = ( ( subringAlg ` W ) ` S ) ) |
|
| srapart.s | |- ( ph -> S C_ ( Base ` W ) ) |
||
| Assertion | sraaddg | |- ( ph -> ( +g ` W ) = ( +g ` A ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | srapart.a | |- ( ph -> A = ( ( subringAlg ` W ) ` S ) ) |
|
| 2 | srapart.s | |- ( ph -> S C_ ( Base ` W ) ) |
|
| 3 | df-plusg | |- +g = Slot 2 |
|
| 4 | 2nn | |- 2 e. NN |
|
| 5 | 2lt5 | |- 2 < 5 |
|
| 6 | 5 | orci | |- ( 2 < 5 \/ 8 < 2 ) |
| 7 | 1 2 3 4 6 | sralem | |- ( ph -> ( +g ` W ) = ( +g ` A ) ) |