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Mirrors > Home > ILE Home > Th. List > dfnfc2 | Unicode version |
Description: An alternate statement of the effective freeness of a class , when it is a set. (Contributed by Mario Carneiro, 14-Oct-2016.) |
Ref | Expression |
---|---|
dfnfc2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfcvd 2282 | . . . 4 | |
2 | id 19 | . . . 4 | |
3 | 1, 2 | nfeqd 2296 | . . 3 |
4 | 3 | alrimiv 1846 | . 2 |
5 | simpr 109 | . . . . . 6 | |
6 | df-nfc 2270 | . . . . . . 7 | |
7 | velsn 3544 | . . . . . . . . 9 | |
8 | 7 | nfbii 1449 | . . . . . . . 8 |
9 | 8 | albii 1446 | . . . . . . 7 |
10 | 6, 9 | bitri 183 | . . . . . 6 |
11 | 5, 10 | sylibr 133 | . . . . 5 |
12 | 11 | nfunid 3743 | . . . 4 |
13 | nfa1 1521 | . . . . . 6 | |
14 | nfnf1 1523 | . . . . . . 7 | |
15 | 14 | nfal 1555 | . . . . . 6 |
16 | 13, 15 | nfan 1544 | . . . . 5 |
17 | unisng 3753 | . . . . . . 7 | |
18 | 17 | sps 1517 | . . . . . 6 |
19 | 18 | adantr 274 | . . . . 5 |
20 | 16, 19 | nfceqdf 2280 | . . . 4 |
21 | 12, 20 | mpbid 146 | . . 3 |
22 | 21 | ex 114 | . 2 |
23 | 4, 22 | impbid2 142 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wb 104 wal 1329 wceq 1331 wnf 1436 wcel 1480 wnfc 2268 csn 3527 cuni 3736 |
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-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rex 2422 df-v 2688 df-un 3075 df-sn 3533 df-pr 3534 df-uni 3737 |
This theorem is referenced by: eusv2nf 4377 |
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