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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 5075 | . . . 4 ⊢ (𝐴 = 𝐵 → (𝐴𝑅𝐶 ↔ 𝐵𝑅𝐶)) | |
| 2 | 1 | biimpcd 250 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2948 | . 2 ⊢ (𝐴𝑅𝐶 → (¬ 𝐵𝑅𝐶 → 𝐴 ≠ 𝐵)) |
| 4 | 3 | imp 407 | 1 ⊢ ((𝐴𝑅𝐶 ∧ ¬ 𝐵𝑅𝐶) → 𝐴 ≠ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 = wceq 1547 ≠ wne 2934 class class class wbr 5072 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-ss 3900 df-nul 4262 df-if 4455 df-sn 4556 df-pr 4558 df-op 4562 df-br 5073 |
| This theorem is referenced by: frfi 9185 ablsimpgfindlem1 20075 ablsimpgfindlem2 20076 hl2at 39897 2atjm 39937 atbtwn 39938 atbtwnexOLDN 39939 atbtwnex 39940 dalem21 40186 dalem23 40188 dalem27 40191 dalem54 40218 2llnma1b 40278 lhpexle1lem 40499 lhpexle3lem 40503 lhp2at0nle 40527 4atexlemunv 40558 4atexlemnclw 40562 4atexlemcnd 40564 cdlemc5 40687 cdleme0b 40704 cdleme0c 40705 cdleme0fN 40710 cdleme01N 40713 cdleme0ex2N 40716 cdleme3b 40721 cdleme3c 40722 cdleme3g 40726 cdleme3h 40727 cdleme7aa 40734 cdleme7b 40736 cdleme7c 40737 cdleme7d 40738 cdleme7e 40739 cdleme7ga 40740 cdleme11fN 40756 cdlemesner 40788 cdlemednpq 40791 cdleme19a 40795 cdleme19c 40797 cdleme21c 40819 cdleme21ct 40821 cdleme22cN 40834 cdleme22f2 40839 cdleme22g 40840 cdleme41sn3aw 40966 cdlemeg46rgv 41020 cdlemeg46req 41021 cdlemf1 41053 cdlemg27b 41188 cdlemg33b0 41193 cdlemg33c0 41194 cdlemh 41309 cdlemk14 41346 dia2dimlem1 41556 |
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