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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 251 | . . 3 ⊢ (𝐴𝑅𝐶 → (𝐴 = 𝐵 → 𝐵𝑅𝐶)) |
| 3 | 2 | necon3bd 2971 | . 2 ⊢ (𝐴𝑅𝐶 → (¬ 𝐵𝑅𝐶 → 𝐴 ≠ 𝐵)) |
| 4 | 3 | imp 410 | 1 ⊢ ((𝐴𝑅𝐶 ∧ ¬ 𝐵𝑅𝐶) → 𝐴 ≠ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 = wceq 1560 ≠ wne 2957 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 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-ext 2734 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-sb 2091 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-rab 3415 df-v 3456 df-dif 3907 df-un 3909 df-ss 3921 df-nul 4286 df-if 4481 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 |
| This theorem is referenced by: frfi 9229 ablsimpgfindlem1 20149 ablsimpgfindlem2 20150 hl2at 40029 2atjm 40069 atbtwn 40070 atbtwnexOLDN 40071 atbtwnex 40072 dalem21 40318 dalem23 40320 dalem27 40323 dalem54 40350 2llnma1b 40410 lhpexle1lem 40631 lhpexle3lem 40635 lhp2at0nle 40659 4atexlemunv 40690 4atexlemnclw 40694 4atexlemcnd 40696 cdlemc5 40819 cdleme0b 40836 cdleme0c 40837 cdleme0fN 40842 cdleme01N 40845 cdleme0ex2N 40848 cdleme3b 40853 cdleme3c 40854 cdleme3g 40858 cdleme3h 40859 cdleme7aa 40866 cdleme7b 40868 cdleme7c 40869 cdleme7d 40870 cdleme7e 40871 cdleme7ga 40872 cdleme11fN 40888 cdlemesner 40920 cdlemednpq 40923 cdleme19a 40927 cdleme19c 40929 cdleme21c 40951 cdleme21ct 40953 cdleme22cN 40966 cdleme22f2 40971 cdleme22g 40972 cdleme41sn3aw 41098 cdlemeg46rgv 41152 cdlemeg46req 41153 cdlemf1 41185 cdlemg27b 41320 cdlemg33b0 41325 cdlemg33c0 41326 cdlemh 41441 cdlemk14 41478 dia2dimlem1 41688 |
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