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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 5101 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 249 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2946 | . 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 2932 class class class wbr 5098 |
| 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 2708 |
| 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 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-br 5099 |
| This theorem is referenced by: frfi 9185 ablsimpgfindlem1 20038 ablsimpgfindlem2 20039 hl2at 39675 2atjm 39715 atbtwn 39716 atbtwnexOLDN 39717 atbtwnex 39718 dalem21 39964 dalem23 39966 dalem27 39969 dalem54 39996 2llnma1b 40056 lhpexle1lem 40277 lhpexle3lem 40281 lhp2at0nle 40305 4atexlemunv 40336 4atexlemnclw 40340 4atexlemcnd 40342 cdlemc5 40465 cdleme0b 40482 cdleme0c 40483 cdleme0fN 40488 cdleme01N 40491 cdleme0ex2N 40494 cdleme3b 40499 cdleme3c 40500 cdleme3g 40504 cdleme3h 40505 cdleme7aa 40512 cdleme7b 40514 cdleme7c 40515 cdleme7d 40516 cdleme7e 40517 cdleme7ga 40518 cdleme11fN 40534 cdlemesner 40566 cdlemednpq 40569 cdleme19a 40573 cdleme19c 40575 cdleme21c 40597 cdleme21ct 40599 cdleme22cN 40612 cdleme22f2 40617 cdleme22g 40618 cdleme41sn3aw 40744 cdlemeg46rgv 40798 cdlemeg46req 40799 cdlemf1 40831 cdlemg27b 40966 cdlemg33b0 40971 cdlemg33c0 40972 cdlemh 41087 cdlemk14 41124 dia2dimlem1 41334 |
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