Description: Apply a choice equivalent. (Contributed by Mario Carneiro, 17-May-2015)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | axaci.1 | |- ( CHOICE <-> A. x ph ) |
|
| Assertion | axaci | |- ph |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axaci.1 | |- ( CHOICE <-> A. x ph ) |
|
| 2 | axac3 | |- CHOICE |
|
| 3 | 2 1 | mpbi | |- A. x ph |
| 4 | 3 | spi | |- ph |