New Foundations Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > NFE Home > Th. List > neeq2d | GIF version |
Description: Deduction for inequality. (Contributed by NM, 25-Oct-1999.) |
Ref | Expression |
---|---|
neeq1d.1 | ⊢ (φ → A = B) |
Ref | Expression |
---|---|
neeq2d | ⊢ (φ → (C ≠ A ↔ C ≠ B)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neeq1d.1 | . 2 ⊢ (φ → A = B) | |
2 | neeq2 2525 | . 2 ⊢ (A = B → (C ≠ A ↔ C ≠ B)) | |
3 | 1, 2 | syl 15 | 1 ⊢ (φ → (C ≠ A ↔ C ≠ B)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 176 = wceq 1642 ≠ wne 2516 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-11 1746 ax-ext 2334 |
This theorem depends on definitions: df-bi 177 df-ex 1542 df-cleq 2346 df-ne 2518 |
This theorem is referenced by: neeq12d 2531 neeqtrd 2538 evenodddisj 4516 |
Copyright terms: Public domain | W3C validator |