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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 5112 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 252 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2972 | . 2 ⊢ (𝐴𝑅𝐶 → (¬ 𝐵𝑅𝐶 → 𝐴 ≠ 𝐵)) |
| 4 | 3 | imp 411 | 1 ⊢ ((𝐴𝑅𝐶 ∧ ¬ 𝐵𝑅𝐶) → 𝐴 ≠ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 = wceq 1570 ≠ wne 2958 class class class wbr 5109 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-ss 3922 df-nul 4287 df-if 4488 df-sn 4590 df-pr 4592 df-op 4596 df-br 5110 |
| This theorem is referenced by: frfi 9241 ablsimpgfindlem1 20174 ablsimpgfindlem2 20175 hl2at 40199 2atjm 40239 atbtwn 40240 atbtwnexOLDN 40241 atbtwnex 40242 dalem21 40488 dalem23 40490 dalem27 40493 dalem54 40520 2llnma1b 40580 lhpexle1lem 40801 lhpexle3lem 40805 lhp2at0nle 40829 4atexlemunv 40860 4atexlemnclw 40864 4atexlemcnd 40866 cdlemc5 40989 cdleme0b 41006 cdleme0c 41007 cdleme0fN 41012 cdleme01N 41015 cdleme0ex2N 41018 cdleme3b 41023 cdleme3c 41024 cdleme3g 41028 cdleme3h 41029 cdleme7aa 41036 cdleme7b 41038 cdleme7c 41039 cdleme7d 41040 cdleme7e 41041 cdleme7ga 41042 cdleme11fN 41058 cdlemesner 41090 cdlemednpq 41093 cdleme19a 41097 cdleme19c 41099 cdleme21c 41121 cdleme21ct 41123 cdleme22cN 41136 cdleme22f2 41141 cdleme22g 41142 cdleme41sn3aw 41268 cdlemeg46rgv 41322 cdlemeg46req 41323 cdlemf1 41355 cdlemg27b 41490 cdlemg33b0 41495 cdlemg33c0 41496 cdlemh 41611 cdlemk14 41648 dia2dimlem1 41858 |
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