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Mirrors > Home > ILE Home > Th. List > prprc1 | Unicode version |
Description: A proper class vanishes in an unordered pair. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
prprc1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snprc 3457 | . 2 | |
2 | uneq1 3119 | . . 3 | |
3 | df-pr 3405 | . . 3 | |
4 | uncom 3116 | . . . 4 | |
5 | un0 3278 | . . . 4 | |
6 | 4, 5 | eqtr2i 2102 | . . 3 |
7 | 2, 3, 6 | 3eqtr4g 2138 | . 2 |
8 | 1, 7 | sylbi 119 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wceq 1284 wcel 1433 cvv 2601 cun 2971 c0 3251 csn 3398 cpr 3399 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-dif 2975 df-un 2977 df-nul 3252 df-sn 3404 df-pr 3405 |
This theorem is referenced by: prprc2 3501 prprc 3502 |
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