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Mirrors > Home > NFE Home > Th. List > necon3bbii | GIF version |
Description: Deduction from equality to inequality. (Contributed by NM, 13-Apr-2007.) |
Ref | Expression |
---|---|
necon3bbii.1 | ⊢ (φ ↔ A = B) |
Ref | Expression |
---|---|
necon3bbii | ⊢ (¬ φ ↔ A ≠ B) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon3bbii.1 | . . . 4 ⊢ (φ ↔ A = B) | |
2 | 1 | bicomi 193 | . . 3 ⊢ (A = B ↔ φ) |
3 | 2 | necon3abii 2546 | . 2 ⊢ (A ≠ B ↔ ¬ φ) |
4 | 3 | bicomi 193 | 1 ⊢ (¬ φ ↔ A ≠ B) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 176 = wceq 1642 ≠ wne 2516 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |
This theorem depends on definitions: df-bi 177 df-ne 2518 |
This theorem is referenced by: nssinpss 3487 difsnpss 3851 foundex 5914 ce0nn 6180 |
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