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| Mirrors > Home > MPE Home > Th. List > nbrne2 | Structured version Visualization version GIF version | ||
| Description: Two classes are different if they don't have the same relationship to a third class. (Contributed by NM, 3-Jun-2012.) |
| Ref | Expression |
|---|---|
| nbrne2 | ⊢ ((𝐴𝑅𝐶 ∧ ¬ 𝐵𝑅𝐶) → 𝐴 ≠ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq1 5099 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 249 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2944 | . 2 ⊢ (𝐴𝑅𝐶 → (¬ 𝐵𝑅𝐶 → 𝐴 ≠ 𝐵)) |
| 4 | 3 | imp 406 | 1 ⊢ ((𝐴𝑅𝐶 ∧ ¬ 𝐵𝑅𝐶) → 𝐴 ≠ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ≠ wne 2930 class class class wbr 5096 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2713 df-cleq 2726 df-clel 2809 df-ne 2931 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-ss 3916 df-nul 4284 df-if 4478 df-sn 4579 df-pr 4581 df-op 4585 df-br 5097 |
| This theorem is referenced by: frfi 9183 ablsimpgfindlem1 20036 ablsimpgfindlem2 20037 hl2at 39604 2atjm 39644 atbtwn 39645 atbtwnexOLDN 39646 atbtwnex 39647 dalem21 39893 dalem23 39895 dalem27 39898 dalem54 39925 2llnma1b 39985 lhpexle1lem 40206 lhpexle3lem 40210 lhp2at0nle 40234 4atexlemunv 40265 4atexlemnclw 40269 4atexlemcnd 40271 cdlemc5 40394 cdleme0b 40411 cdleme0c 40412 cdleme0fN 40417 cdleme01N 40420 cdleme0ex2N 40423 cdleme3b 40428 cdleme3c 40429 cdleme3g 40433 cdleme3h 40434 cdleme7aa 40441 cdleme7b 40443 cdleme7c 40444 cdleme7d 40445 cdleme7e 40446 cdleme7ga 40447 cdleme11fN 40463 cdlemesner 40495 cdlemednpq 40498 cdleme19a 40502 cdleme19c 40504 cdleme21c 40526 cdleme21ct 40528 cdleme22cN 40541 cdleme22f2 40546 cdleme22g 40547 cdleme41sn3aw 40673 cdlemeg46rgv 40727 cdlemeg46req 40728 cdlemf1 40760 cdlemg27b 40895 cdlemg33b0 40900 cdlemg33c0 40901 cdlemh 41016 cdlemk14 41053 dia2dimlem1 41263 |
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