theorem all0 (A: set): $ all A 0 $;
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | absurd | ~x e. lmems 0 -> x e. lmems 0 -> x e. A | |
| 2 | lmem0 | ~x IN 0 | |
| 3 | 2 | conv lmem | ~x e. lmems 0 | 
| 4 | 1, 3 | ax_mp | x e. lmems 0 -> x e. A | 
| 5 | 4 | ax_gen | A. x (x e. lmems 0 -> x e. A) | 
| 6 | 5 | conv all, subset | all A 0 |