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Mirrors > Home > ILE Home > Th. List > peano2b | Unicode version |
Description: A class belongs to omega iff its successor does. (Contributed by NM, 3-Dec-1995.) |
Ref | Expression |
---|---|
peano2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano2 4479 | . 2 | |
2 | elex 2671 | . . . . 5 | |
3 | sucexb 4383 | . . . . 5 | |
4 | 2, 3 | sylibr 133 | . . . 4 |
5 | sucidg 4308 | . . . 4 | |
6 | 4, 5 | syl 14 | . . 3 |
7 | elnn 4489 | . . 3 | |
8 | 6, 7 | mpancom 418 | . 2 |
9 | 1, 8 | impbii 125 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wcel 1465 cvv 2660 csuc 4257 com 4474 |
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-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-nul 4024 ax-pow 4068 ax-pr 4101 ax-un 4325 ax-iinf 4472 |
This theorem depends on definitions: df-bi 116 df-3an 949 df-tru 1319 df-nf 1422 df-sb 1721 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ral 2398 df-rex 2399 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-uni 3707 df-int 3742 df-suc 4263 df-iom 4475 |
This theorem is referenced by: nnpredcl 4506 nnmsucr 6352 |
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