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Description: The induction postulate: any class containing zero and closed under the successor operation contains all natural numbers. One of Peano's five postulates for arithmetic. Proposition 7.30(5) of [TakeutiZaring] p. 43. The more traditional statement of mathematical induction as a theorem schema, with a basis and an induction step, is derived from this theorem as theorem findes 4326. (Contributed by NM, 18-Feb-2004.) |
Ref | Expression |
---|---|
peano5 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfom3 4315 | . . 3 | |
2 | peano1 4317 | . . . . . . . 8 | |
3 | elin 3126 | . . . . . . . 8 | |
4 | 2, 3 | mpbiran 847 | . . . . . . 7 |
5 | 4 | biimpri 124 | . . . . . 6 |
6 | peano2 4318 | . . . . . . . . . . . 12 | |
7 | 6 | adantr 261 | . . . . . . . . . . 11 |
8 | 7 | a1i 9 | . . . . . . . . . 10 |
9 | pm3.31 249 | . . . . . . . . . 10 | |
10 | 8, 9 | jcad 291 | . . . . . . . . 9 |
11 | 10 | alimi 1344 | . . . . . . . 8 |
12 | df-ral 2311 | . . . . . . . 8 | |
13 | elin 3126 | . . . . . . . . . 10 | |
14 | elin 3126 | . . . . . . . . . 10 | |
15 | 13, 14 | imbi12i 228 | . . . . . . . . 9 |
16 | 15 | albii 1359 | . . . . . . . 8 |
17 | 11, 12, 16 | 3imtr4i 190 | . . . . . . 7 |
18 | df-ral 2311 | . . . . . . 7 | |
19 | 17, 18 | sylibr 137 | . . . . . 6 |
20 | 5, 19 | anim12i 321 | . . . . 5 |
21 | omex 4316 | . . . . . . 7 | |
22 | 21 | inex1 3891 | . . . . . 6 |
23 | eleq2 2101 | . . . . . . 7 | |
24 | eleq2 2101 | . . . . . . . 8 | |
25 | 24 | raleqbi1dv 2513 | . . . . . . 7 |
26 | 23, 25 | anbi12d 442 | . . . . . 6 |
27 | 22, 26 | elab 2687 | . . . . 5 |
28 | 20, 27 | sylibr 137 | . . . 4 |
29 | intss1 3630 | . . . 4 | |
30 | 28, 29 | syl 14 | . . 3 |
31 | 1, 30 | syl5eqss 2989 | . 2 |
32 | ssid 2964 | . . . 4 | |
33 | 32 | biantrur 287 | . . 3 |
34 | ssin 3159 | . . 3 | |
35 | 33, 34 | bitri 173 | . 2 |
36 | 31, 35 | sylibr 137 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wal 1241 wceq 1243 wcel 1393 cab 2026 wral 2306 cin 2916 wss 2917 c0 3224 cint 3615 csuc 4102 com 4313 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-nul 3883 ax-pow 3927 ax-pr 3944 ax-un 4170 ax-iinf 4311 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-rex 2312 df-v 2559 df-dif 2920 df-un 2922 df-in 2924 df-ss 2931 df-nul 3225 df-pw 3361 df-sn 3381 df-pr 3382 df-uni 3581 df-int 3616 df-suc 4108 df-iom 4314 |
This theorem is referenced by: find 4322 finds 4323 finds2 4324 indpi 6440 |
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