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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 5108 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 252 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2974 | . 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 1563 ≠ wne 2960 class class class wbr 5105 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-ss 3924 df-nul 4289 df-if 4484 df-sn 4586 df-pr 4588 df-op 4592 df-br 5106 |
| This theorem is referenced by: frfi 9233 ablsimpgfindlem1 20170 ablsimpgfindlem2 20171 hl2at 40041 2atjm 40081 atbtwn 40082 atbtwnexOLDN 40083 atbtwnex 40084 dalem21 40330 dalem23 40332 dalem27 40335 dalem54 40362 2llnma1b 40422 lhpexle1lem 40643 lhpexle3lem 40647 lhp2at0nle 40671 4atexlemunv 40702 4atexlemnclw 40706 4atexlemcnd 40708 cdlemc5 40831 cdleme0b 40848 cdleme0c 40849 cdleme0fN 40854 cdleme01N 40857 cdleme0ex2N 40860 cdleme3b 40865 cdleme3c 40866 cdleme3g 40870 cdleme3h 40871 cdleme7aa 40878 cdleme7b 40880 cdleme7c 40881 cdleme7d 40882 cdleme7e 40883 cdleme7ga 40884 cdleme11fN 40900 cdlemesner 40932 cdlemednpq 40935 cdleme19a 40939 cdleme19c 40941 cdleme21c 40963 cdleme21ct 40965 cdleme22cN 40978 cdleme22f2 40983 cdleme22g 40984 cdleme41sn3aw 41110 cdlemeg46rgv 41164 cdlemeg46req 41165 cdlemf1 41197 cdlemg27b 41332 cdlemg33b0 41337 cdlemg33c0 41338 cdlemh 41453 cdlemk14 41490 dia2dimlem1 41700 |
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