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Mirrors > Home > ILE Home > Th. List > elsucg | Unicode version |
Description: Membership in a successor. Exercise 5 of [TakeutiZaring] p. 17. (Contributed by NM, 15-Sep-1995.) |
Ref | Expression |
---|---|
elsucg |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-suc 4293 | . . . 4 | |
2 | 1 | eleq2i 2206 | . . 3 |
3 | elun 3217 | . . 3 | |
4 | 2, 3 | bitri 183 | . 2 |
5 | elsng 3542 | . . 3 | |
6 | 5 | orbi2d 779 | . 2 |
7 | 4, 6 | syl5bb 191 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wo 697 wceq 1331 wcel 1480 cun 3069 csn 3527 csuc 4287 |
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-v 2688 df-un 3075 df-sn 3533 df-suc 4293 |
This theorem is referenced by: elsuc 4328 elelsuc 4331 sucidg 4338 onsucelsucr 4424 onsucsssucexmid 4442 suc11g 4472 nnsssuc 6398 nlt1pig 7149 bj-peano4 13153 |
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