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Mirrors > Home > ILE Home > Th. List > suc11g | Unicode version |
Description: The successor operation behaves like a one-to-one function (assuming the Axiom of Set Induction). Similar to Exercise 35 of [Enderton] p. 208 and its converse. (Contributed by NM, 25-Oct-2003.) |
Ref | Expression |
---|---|
suc11g |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | en2lp 4278 | . . . 4 | |
2 | sucidg 4153 | . . . . . . . . . . . 12 | |
3 | eleq2 2101 | . . . . . . . . . . . 12 | |
4 | 2, 3 | syl5ibrcom 146 | . . . . . . . . . . 11 |
5 | elsucg 4141 | . . . . . . . . . . 11 | |
6 | 4, 5 | sylibd 138 | . . . . . . . . . 10 |
7 | 6 | imp 115 | . . . . . . . . 9 |
8 | 7 | 3adant1 922 | . . . . . . . 8 |
9 | sucidg 4153 | . . . . . . . . . . . 12 | |
10 | eleq2 2101 | . . . . . . . . . . . 12 | |
11 | 9, 10 | syl5ibcom 144 | . . . . . . . . . . 11 |
12 | elsucg 4141 | . . . . . . . . . . 11 | |
13 | 11, 12 | sylibd 138 | . . . . . . . . . 10 |
14 | 13 | imp 115 | . . . . . . . . 9 |
15 | 14 | 3adant2 923 | . . . . . . . 8 |
16 | 8, 15 | jca 290 | . . . . . . 7 |
17 | eqcom 2042 | . . . . . . . . 9 | |
18 | 17 | orbi2i 679 | . . . . . . . 8 |
19 | 18 | anbi1i 431 | . . . . . . 7 |
20 | 16, 19 | sylib 127 | . . . . . 6 |
21 | ordir 730 | . . . . . 6 | |
22 | 20, 21 | sylibr 137 | . . . . 5 |
23 | 22 | ord 643 | . . . 4 |
24 | 1, 23 | mpi 15 | . . 3 |
25 | 24 | 3expia 1106 | . 2 |
26 | suceq 4139 | . 2 | |
27 | 25, 26 | impbid1 130 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 97 wb 98 wo 629 w3a 885 wceq 1243 wcel 1393 csuc 4102 |
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-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-setind 4262 |
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-v 2559 df-dif 2920 df-un 2922 df-sn 3381 df-pr 3382 df-suc 4108 |
This theorem is referenced by: suc11 4282 peano4 4320 frecsuclem3 5990 |
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