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Mirrors > Home > MPE Home > Th. List > neeq1d | Structured version Visualization version GIF version |
Description: Deduction for inequality. (Contributed by NM, 25-Oct-1999.) (Proof shortened by Wolf Lammen, 19-Nov-2019.) |
Ref | Expression |
---|---|
neeq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
neeq1d | ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neeq1d.1 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | 1 | eqeq1d 2740 | . 2 ⊢ (𝜑 → (𝐴 = 𝐶 ↔ 𝐵 = 𝐶)) |
3 | 2 | necon3bid 2987 | 1 ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
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