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Mirrors > Home > ILE Home > Th. List > eusv2i | Unicode version |
Description: Two ways to express single-valuedness of a class expression . (Contributed by NM, 14-Oct-2010.) (Revised by Mario Carneiro, 18-Nov-2016.) |
Ref | Expression |
---|---|
eusv2i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfeu1 2010 | . . 3 | |
2 | nfcvd 2282 | . . . . . 6 | |
3 | eusvnf 4374 | . . . . . 6 | |
4 | 2, 3 | nfeqd 2296 | . . . . 5 |
5 | nf2 1646 | . . . . 5 | |
6 | 4, 5 | sylib 121 | . . . 4 |
7 | 19.2 1617 | . . . 4 | |
8 | 6, 7 | impbid1 141 | . . 3 |
9 | 1, 8 | eubid 2006 | . 2 |
10 | 9 | ibir 176 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wal 1329 wceq 1331 wnf 1436 wex 1468 weu 1999 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-sbc 2910 df-csb 3004 |
This theorem is referenced by: eusv2nf 4377 |
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