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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 5103 | . . . 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 5100 |
| 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 3402 df-v 3444 df-dif 3906 df-un 3908 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 |
| This theorem is referenced by: frfi 9197 ablsimpgfindlem1 20050 ablsimpgfindlem2 20051 hl2at 39781 2atjm 39821 atbtwn 39822 atbtwnexOLDN 39823 atbtwnex 39824 dalem21 40070 dalem23 40072 dalem27 40075 dalem54 40102 2llnma1b 40162 lhpexle1lem 40383 lhpexle3lem 40387 lhp2at0nle 40411 4atexlemunv 40442 4atexlemnclw 40446 4atexlemcnd 40448 cdlemc5 40571 cdleme0b 40588 cdleme0c 40589 cdleme0fN 40594 cdleme01N 40597 cdleme0ex2N 40600 cdleme3b 40605 cdleme3c 40606 cdleme3g 40610 cdleme3h 40611 cdleme7aa 40618 cdleme7b 40620 cdleme7c 40621 cdleme7d 40622 cdleme7e 40623 cdleme7ga 40624 cdleme11fN 40640 cdlemesner 40672 cdlemednpq 40675 cdleme19a 40679 cdleme19c 40681 cdleme21c 40703 cdleme21ct 40705 cdleme22cN 40718 cdleme22f2 40723 cdleme22g 40724 cdleme41sn3aw 40850 cdlemeg46rgv 40904 cdlemeg46req 40905 cdlemf1 40937 cdlemg27b 41072 cdlemg33b0 41077 cdlemg33c0 41078 cdlemh 41193 cdlemk14 41230 dia2dimlem1 41440 |
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