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Mirrors > Home > ILE Home > Th. List > nnsucsssuc | Unicode version |
Description: Membership is inherited by successors. The reverse direction holds for all ordinals, as seen at onsucsssucr 4420, but the forward direction, for all ordinals, implies excluded middle as seen as onsucsssucexmid 4437. (Contributed by Jim Kingdon, 25-Aug-2019.) |
Ref | Expression |
---|---|
nnsucsssuc |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1 3115 | . . . . . 6 | |
2 | suceq 4319 | . . . . . . 7 | |
3 | 2 | sseq1d 3121 | . . . . . 6 |
4 | 1, 3 | imbi12d 233 | . . . . 5 |
5 | 4 | imbi2d 229 | . . . 4 |
6 | sseq1 3115 | . . . . . 6 | |
7 | suceq 4319 | . . . . . . 7 | |
8 | 7 | sseq1d 3121 | . . . . . 6 |
9 | 6, 8 | imbi12d 233 | . . . . 5 |
10 | sseq1 3115 | . . . . . 6 | |
11 | suceq 4319 | . . . . . . 7 | |
12 | 11 | sseq1d 3121 | . . . . . 6 |
13 | 10, 12 | imbi12d 233 | . . . . 5 |
14 | sseq1 3115 | . . . . . 6 | |
15 | suceq 4319 | . . . . . . 7 | |
16 | 15 | sseq1d 3121 | . . . . . 6 |
17 | 14, 16 | imbi12d 233 | . . . . 5 |
18 | peano3 4505 | . . . . . . . . 9 | |
19 | 18 | neneqd 2327 | . . . . . . . 8 |
20 | peano2 4504 | . . . . . . . . . 10 | |
21 | 0elnn 4527 | . . . . . . . . . 10 | |
22 | 20, 21 | syl 14 | . . . . . . . . 9 |
23 | 22 | ord 713 | . . . . . . . 8 |
24 | 19, 23 | mpd 13 | . . . . . . 7 |
25 | nnord 4520 | . . . . . . . 8 | |
26 | ordsucim 4411 | . . . . . . . 8 | |
27 | 0ex 4050 | . . . . . . . . 9 | |
28 | ordelsuc 4416 | . . . . . . . . 9 | |
29 | 27, 28 | mpan 420 | . . . . . . . 8 |
30 | 25, 26, 29 | 3syl 17 | . . . . . . 7 |
31 | 24, 30 | mpbid 146 | . . . . . 6 |
32 | 31 | a1d 22 | . . . . 5 |
33 | simp3 983 | . . . . . . . . . 10 | |
34 | simp1l 1005 | . . . . . . . . . . 11 | |
35 | simp1r 1006 | . . . . . . . . . . . 12 | |
36 | 35, 25 | syl 14 | . . . . . . . . . . 11 |
37 | ordelsuc 4416 | . . . . . . . . . . 11 | |
38 | 34, 36, 37 | syl2anc 408 | . . . . . . . . . 10 |
39 | 33, 38 | mpbird 166 | . . . . . . . . 9 |
40 | nnsucelsuc 6380 | . . . . . . . . . 10 | |
41 | 35, 40 | syl 14 | . . . . . . . . 9 |
42 | 39, 41 | mpbid 146 | . . . . . . . 8 |
43 | peano2 4504 | . . . . . . . . . 10 | |
44 | 34, 43 | syl 14 | . . . . . . . . 9 |
45 | 36, 26 | syl 14 | . . . . . . . . 9 |
46 | ordelsuc 4416 | . . . . . . . . 9 | |
47 | 44, 45, 46 | syl2anc 408 | . . . . . . . 8 |
48 | 42, 47 | mpbid 146 | . . . . . . 7 |
49 | 48 | 3expia 1183 | . . . . . 6 |
50 | 49 | exp31 361 | . . . . 5 |
51 | 9, 13, 17, 32, 50 | finds2 4510 | . . . 4 |
52 | 5, 51 | vtoclga 2747 | . . 3 |
53 | 52 | imp 123 | . 2 |
54 | nnon 4518 | . . 3 | |
55 | onsucsssucr 4420 | . . 3 | |
56 | 54, 25, 55 | syl2an 287 | . 2 |
57 | 53, 56 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wb 104 wo 697 w3a 962 wceq 1331 wcel 1480 cvv 2681 wss 3066 c0 3358 word 4279 con0 4280 csuc 4282 com 4499 |
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 603 ax-in2 604 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-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-iinf 4497 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-rex 2420 df-v 2683 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-uni 3732 df-int 3767 df-tr 4022 df-iord 4283 df-on 4285 df-suc 4288 df-iom 4500 |
This theorem is referenced by: nnaword 6400 ennnfonelemk 11902 ennnfonelemkh 11914 |
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