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Mirrors > Home > MPE Home > Th. List > necomi | Structured version Visualization version GIF version |
Description: Inference from commutative law for inequality. (Contributed by NM, 17-Oct-2012.) |
Ref | Expression |
---|---|
necomi.1 | ⊢ 𝐴 ≠ 𝐵 |
Ref | Expression |
---|---|
necomi | ⊢ 𝐵 ≠ 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necomi.1 | . 2 ⊢ 𝐴 ≠ 𝐵 | |
2 | necom 2997 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐵 ≠ 𝐴) | |
3 | 1, 2 | mpbi 229 | 1 ⊢ 𝐵 ≠ 𝐴 |
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