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Mirrors > Home > ILE Home > Th. List > elnn | Unicode version |
Description: A member of a natural number is a natural number. (Contributed by NM, 21-Jun-1998.) |
Ref | Expression |
---|---|
elnn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1 3115 | . . 3 | |
2 | sseq1 3115 | . . 3 | |
3 | sseq1 3115 | . . 3 | |
4 | sseq1 3115 | . . 3 | |
5 | 0ss 3396 | . . 3 | |
6 | unss 3245 | . . . . . 6 | |
7 | vex 2684 | . . . . . . . 8 | |
8 | 7 | snss 3644 | . . . . . . 7 |
9 | 8 | anbi2i 452 | . . . . . 6 |
10 | df-suc 4288 | . . . . . . 7 | |
11 | 10 | sseq1i 3118 | . . . . . 6 |
12 | 6, 9, 11 | 3bitr4i 211 | . . . . 5 |
13 | 12 | biimpi 119 | . . . 4 |
14 | 13 | expcom 115 | . . 3 |
15 | 1, 2, 3, 4, 5, 14 | finds 4509 | . 2 |
16 | ssel2 3087 | . . 3 | |
17 | 16 | ancoms 266 | . 2 |
18 | 15, 17 | sylan2 284 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wcel 1480 cun 3064 wss 3066 c0 3358 csn 3522 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-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-suc 4288 df-iom 4500 |
This theorem is referenced by: ordom 4515 peano2b 4523 nntr2 6392 nndifsnid 6396 nnaordi 6397 nnmordi 6405 fidceq 6756 nnwetri 6797 enumctlemm 6992 ennnfonelemdm 11922 ennnfonelemnn0 11924 nnti 13180 nninfsellemdc 13195 nninfsellemeq 13199 nninfsellemeqinf 13201 |
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