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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 5116 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 252 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2978 | . 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 1567 ≠ wne 2964 class class class wbr 5113 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5114 |
| This theorem is referenced by: frfi 9245 ablsimpgfindlem1 20179 ablsimpgfindlem2 20180 hl2at 40069 2atjm 40109 atbtwn 40110 atbtwnexOLDN 40111 atbtwnex 40112 dalem21 40358 dalem23 40360 dalem27 40363 dalem54 40390 2llnma1b 40450 lhpexle1lem 40671 lhpexle3lem 40675 lhp2at0nle 40699 4atexlemunv 40730 4atexlemnclw 40734 4atexlemcnd 40736 cdlemc5 40859 cdleme0b 40876 cdleme0c 40877 cdleme0fN 40882 cdleme01N 40885 cdleme0ex2N 40888 cdleme3b 40893 cdleme3c 40894 cdleme3g 40898 cdleme3h 40899 cdleme7aa 40906 cdleme7b 40908 cdleme7c 40909 cdleme7d 40910 cdleme7e 40911 cdleme7ga 40912 cdleme11fN 40928 cdlemesner 40960 cdlemednpq 40963 cdleme19a 40967 cdleme19c 40969 cdleme21c 40991 cdleme21ct 40993 cdleme22cN 41006 cdleme22f2 41011 cdleme22g 41012 cdleme41sn3aw 41138 cdlemeg46rgv 41192 cdlemeg46req 41193 cdlemf1 41225 cdlemg27b 41360 cdlemg33b0 41365 cdlemg33c0 41366 cdlemh 41481 cdlemk14 41518 dia2dimlem1 41728 |
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