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| Description: A property of proper class as the second argument of a binary relation. |
| Ref | Expression |
|---|---|
| brprc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opprc2 2495 |
. . 3
| |
| 2 | 1 | eleq1d 1537 |
. 2
|
| 3 | df-br 2615 |
. 2
| |
| 4 | df-br 2615 |
. 2
| |
| 5 | 2, 3, 4 | 3bitr4g 554 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: vtoclrbr 3207 vtoclibr 3208 issetid 3275 f1oen2g 4381 f1domg 4383 unen 4420 sdomex 4459 numth2 4765 cardval 4806 elfzlem 6413 pstr 8594 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-12 966 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-v 1808 df-dif 2045 df-un 2046 df-nul 2277 df-sn 2408 df-pr 2409 df-op 2412 df-br 2615 |