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| Mirrors > Home > ILE Home > Th. List > neeq1 | GIF version | ||
| Description: Equality theorem for inequality. (Contributed by NM, 19-Nov-1994.) |
| Ref | Expression |
|---|---|
| neeq1 | ⊢ (𝐴 = 𝐵 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq1 2241 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 = 𝐶 ↔ 𝐵 = 𝐶)) | |
| 2 | 1 | notbid 673 | . 2 ⊢ (𝐴 = 𝐵 → (¬ 𝐴 = 𝐶 ↔ ¬ 𝐵 = 𝐶)) |
| 3 | df-ne 2415 | . 2 ⊢ (𝐴 ≠ 𝐶 ↔ ¬ 𝐴 = 𝐶) | |
| 4 | df-ne 2415 | . 2 ⊢ (𝐵 ≠ 𝐶 ↔ ¬ 𝐵 = 𝐶) | |
| 5 | 2, 3, 4 | 3bitr4g 223 | 1 ⊢ (𝐴 = 𝐵 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 = wceq 1398 ≠ wne 2414 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-5 1496 ax-gen 1498 ax-4 1559 ax-17 1575 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-cleq 2227 df-ne 2415 |
| This theorem is referenced by: neeq1i 2429 neeq1d 2432 nelrdva 3027 disji2 4106 0inp0 4284 frecabcl 6643 fiintim 7204 eldju2ndl 7376 updjudhf 7383 netap 7584 2oneel 7586 2omotaplemap 7587 2omotaplemst 7588 exmidapne 7590 xnn0nemnf 9591 uzn0 9888 xrnemnf 10129 xrnepnf 10130 ngtmnft 10169 xsubge0 10233 xposdif 10234 xleaddadd 10239 fztpval 10439 hashdmprop2dom 11241 fun2dmnop0 11247 pcpre1 13015 pcqmul 13026 pcqcl 13029 xpsfrnel 13608 isnzr2 14429 fiinopn 14995 umgrvad2edg 16332 isclwwlk 16515 eupth2lem2dc 16580 eupth2lem3lem6fi 16592 eupth2lem3lem4fi 16594 3dom 16888 pw1ndom3lem 16889 qdiff 16959 neapmkv 16980 neap0mkv 16981 ltlenmkv 16982 |
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