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| Mirrors > Home > ILE Home > Th. List > neeq1d | GIF version | ||
| Description: Deduction for inequality. (Contributed by NM, 25-Oct-1999.) |
| Ref | Expression |
|---|---|
| neeq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| neeq1d | ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | neeq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | neeq1 2433 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ≠ wne 2420 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-5 1500 ax-gen 1502 ax-4 1563 ax-17 1579 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 df-ne 2421 |
| This theorem is used by: neeq12d 2440 eqnetrd 2444 prnzg 3838 suppval1 6483 elsuppfng 6486 elsuppfn 6487 suppsnopdc 6494 ressuppss 6498 pw2f1odclem 7139 hashprg 11272 algcvg 12852 algcvga 12855 eucalgcvga 12862 rpdvds 12903 phibndlem 13024 dfphi2 13028 pcaddlem 13148 ennnfoneleminc 13361 ennnfonelemex 13364 ennnfonelemhom 13365 ennnfonelemnn0 13372 ennnfonelemr 13373 ennnfonelemim 13374 ctinfomlemom 13377 setscomd 13452 rrgsupp 14684 pellexlem3 16243 lgsne0 16374 umgr2cwwkdifex 16883 dceqnconst 17329 dcapnconst 17330 nconstwlpolem 17334 |
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