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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 3020 | . . 3 | |
2 | sseq1 3020 | . . 3 | |
3 | sseq1 3020 | . . 3 | |
4 | sseq1 3020 | . . 3 | |
5 | 0ss 3282 | . . 3 | |
6 | unss 3146 | . . . . . 6 | |
7 | vex 2604 | . . . . . . . 8 | |
8 | 7 | snss 3516 | . . . . . . 7 |
9 | 8 | anbi2i 444 | . . . . . 6 |
10 | df-suc 4126 | . . . . . . 7 | |
11 | 10 | sseq1i 3023 | . . . . . 6 |
12 | 6, 9, 11 | 3bitr4i 210 | . . . . 5 |
13 | 12 | biimpi 118 | . . . 4 |
14 | 13 | expcom 114 | . . 3 |
15 | 1, 2, 3, 4, 5, 14 | finds 4341 | . 2 |
16 | ssel2 2994 | . . 3 | |
17 | 16 | ancoms 264 | . 2 |
18 | 15, 17 | sylan2 280 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wcel 1433 cun 2971 wss 2973 c0 3251 csn 3398 csuc 4120 com 4331 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-iinf 4329 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 df-pr 3405 df-uni 3602 df-int 3637 df-suc 4126 df-iom 4332 |
This theorem is referenced by: ordom 4347 peano2b 4355 nndifsnid 6103 nnaordi 6104 nnmordi 6112 fidceq 6354 nnwetri 6382 |
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