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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 5089 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 249 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2947 | . 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 1542 ≠ wne 2933 class class class wbr 5086 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-br 5087 |
| This theorem is referenced by: frfi 9189 ablsimpgfindlem1 20078 ablsimpgfindlem2 20079 hl2at 39868 2atjm 39908 atbtwn 39909 atbtwnexOLDN 39910 atbtwnex 39911 dalem21 40157 dalem23 40159 dalem27 40162 dalem54 40189 2llnma1b 40249 lhpexle1lem 40470 lhpexle3lem 40474 lhp2at0nle 40498 4atexlemunv 40529 4atexlemnclw 40533 4atexlemcnd 40535 cdlemc5 40658 cdleme0b 40675 cdleme0c 40676 cdleme0fN 40681 cdleme01N 40684 cdleme0ex2N 40687 cdleme3b 40692 cdleme3c 40693 cdleme3g 40697 cdleme3h 40698 cdleme7aa 40705 cdleme7b 40707 cdleme7c 40708 cdleme7d 40709 cdleme7e 40710 cdleme7ga 40711 cdleme11fN 40727 cdlemesner 40759 cdlemednpq 40762 cdleme19a 40766 cdleme19c 40768 cdleme21c 40790 cdleme21ct 40792 cdleme22cN 40805 cdleme22f2 40810 cdleme22g 40811 cdleme41sn3aw 40937 cdlemeg46rgv 40991 cdlemeg46req 40992 cdlemf1 41024 cdlemg27b 41159 cdlemg33b0 41164 cdlemg33c0 41165 cdlemh 41280 cdlemk14 41317 dia2dimlem1 41527 |
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