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Mirrors > Home > MPE Home > Th. List > ssfin4 | Structured version Visualization version Unicode version |
Description: Dedekind finite sets have Dedekind finite subsets. (Contributed by Stefan O'Rear, 30-Oct-2014.) (Revised by Mario Carneiro, 6-May-2015.) (Revised by Mario Carneiro, 16-May-2015.) |
Ref | Expression |
---|---|
ssfin4 | FinIV FinIV |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpll 790 | . . . 4 FinIV FinIV | |
2 | pssss 3702 | . . . . . . . . 9 | |
3 | simpr 477 | . . . . . . . . 9 FinIV | |
4 | 2, 3 | sylan9ssr 3617 | . . . . . . . 8 FinIV |
5 | difssd 3738 | . . . . . . . 8 FinIV | |
6 | 4, 5 | unssd 3789 | . . . . . . 7 FinIV |
7 | pssnel 4039 | . . . . . . . . 9 | |
8 | 7 | adantl 482 | . . . . . . . 8 FinIV |
9 | simpllr 799 | . . . . . . . . . . 11 FinIV | |
10 | simprl 794 | . . . . . . . . . . 11 FinIV | |
11 | 9, 10 | sseldd 3604 | . . . . . . . . . 10 FinIV |
12 | simprr 796 | . . . . . . . . . . 11 FinIV | |
13 | elndif 3734 | . . . . . . . . . . . 12 | |
14 | 13 | ad2antrl 764 | . . . . . . . . . . 11 FinIV |
15 | ioran 511 | . . . . . . . . . . . 12 | |
16 | elun 3753 | . . . . . . . . . . . 12 | |
17 | 15, 16 | xchnxbir 323 | . . . . . . . . . . 11 |
18 | 12, 14, 17 | sylanbrc 698 | . . . . . . . . . 10 FinIV |
19 | nelneq2 2726 | . . . . . . . . . 10 | |
20 | 11, 18, 19 | syl2anc 693 | . . . . . . . . 9 FinIV |
21 | eqcom 2629 | . . . . . . . . 9 | |
22 | 20, 21 | sylnib 318 | . . . . . . . 8 FinIV |
23 | 8, 22 | exlimddv 1863 | . . . . . . 7 FinIV |
24 | dfpss2 3692 | . . . . . . 7 | |
25 | 6, 23, 24 | sylanbrc 698 | . . . . . 6 FinIV |
26 | 25 | adantrr 753 | . . . . 5 FinIV |
27 | simprr 796 | . . . . . . 7 FinIV | |
28 | difexg 4808 | . . . . . . . 8 FinIV | |
29 | enrefg 7987 | . . . . . . . 8 | |
30 | 1, 28, 29 | 3syl 18 | . . . . . . 7 FinIV |
31 | 2 | ad2antrl 764 | . . . . . . . . . 10 FinIV |
32 | ssinss1 3841 | . . . . . . . . . 10 | |
33 | 31, 32 | syl 17 | . . . . . . . . 9 FinIV |
34 | inssdif0 3947 | . . . . . . . . 9 | |
35 | 33, 34 | sylib 208 | . . . . . . . 8 FinIV |
36 | disjdif 4040 | . . . . . . . 8 | |
37 | 35, 36 | jctir 561 | . . . . . . 7 FinIV |
38 | unen 8040 | . . . . . . 7 | |
39 | 27, 30, 37, 38 | syl21anc 1325 | . . . . . 6 FinIV |
40 | simplr 792 | . . . . . . 7 FinIV | |
41 | undif 4049 | . . . . . . 7 | |
42 | 40, 41 | sylib 208 | . . . . . 6 FinIV |
43 | 39, 42 | breqtrd 4679 | . . . . 5 FinIV |
44 | fin4i 9120 | . . . . 5 FinIV | |
45 | 26, 43, 44 | syl2anc 693 | . . . 4 FinIV FinIV |
46 | 1, 45 | pm2.65da 600 | . . 3 FinIV |
47 | 46 | nexdv 1864 | . 2 FinIV |
48 | ssexg 4804 | . . . 4 FinIV | |
49 | 48 | ancoms 469 | . . 3 FinIV |
50 | isfin4 9119 | . . 3 FinIV | |
51 | 49, 50 | syl 17 | . 2 FinIV FinIV |
52 | 47, 51 | mpbird 247 | 1 FinIV FinIV |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 wo 383 wa 384 wceq 1483 wex 1704 wcel 1990 cvv 3200 cdif 3571 cun 3572 cin 3573 wss 3574 wpss 3575 c0 3915 class class class wbr 4653 cen 7952 FinIVcfin4 9102 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-en 7956 df-fin4 9109 |
This theorem is referenced by: domfin4 9133 |
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