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Mirrors > Home > MPE Home > Th. List > nne | Structured version Visualization version GIF version |
Description: Negation of inequality. (Contributed by NM, 9-Jun-2006.) |
Ref | Expression |
---|---|
nne | ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ne 2943 | . . 3 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐴 = 𝐵) | |
2 | 1 | con2bii 357 | . 2 ⊢ (𝐴 = 𝐵 ↔ ¬ 𝐴 ≠ 𝐵) |
3 | 2 | bicomi 223 | 1 ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) |
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