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Mirrors > Home > ILE Home > Th. List > phplem2 | Unicode version |
Description: Lemma for Pigeonhole Principle. A natural number is equinumerous to its successor minus one of its elements. (Contributed by NM, 11-Jun-1998.) (Revised by Mario Carneiro, 16-Nov-2014.) |
Ref | Expression |
---|---|
phplem2.1 | |
phplem2.2 |
Ref | Expression |
---|---|
phplem2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | phplem2.2 | . . . . . . . 8 | |
2 | phplem2.1 | . . . . . . . 8 | |
3 | 1, 2 | opex 3984 | . . . . . . 7 |
4 | 3 | snex 3957 | . . . . . 6 |
5 | 1, 2 | f1osn 5186 | . . . . . 6 |
6 | f1oen3g 6257 | . . . . . 6 | |
7 | 4, 5, 6 | mp2an 416 | . . . . 5 |
8 | difss 3098 | . . . . . . 7 | |
9 | 2, 8 | ssexi 3916 | . . . . . 6 |
10 | 9 | enref 6268 | . . . . 5 |
11 | 7, 10 | pm3.2i 266 | . . . 4 |
12 | incom 3158 | . . . . . 6 | |
13 | ssrin 3191 | . . . . . . . . 9 | |
14 | 8, 13 | ax-mp 7 | . . . . . . . 8 |
15 | nnord 4352 | . . . . . . . . 9 | |
16 | orddisj 4289 | . . . . . . . . 9 | |
17 | 15, 16 | syl 14 | . . . . . . . 8 |
18 | 14, 17 | syl5sseq 3047 | . . . . . . 7 |
19 | ss0 3284 | . . . . . . 7 | |
20 | 18, 19 | syl 14 | . . . . . 6 |
21 | 12, 20 | syl5eq 2125 | . . . . 5 |
22 | disjdif 3316 | . . . . 5 | |
23 | 21, 22 | jctil 305 | . . . 4 |
24 | unen 6316 | . . . 4 | |
25 | 11, 23, 24 | sylancr 405 | . . 3 |
26 | 25 | adantr 270 | . 2 |
27 | uncom 3116 | . . 3 | |
28 | nndifsnid 6103 | . . 3 | |
29 | 27, 28 | syl5eq 2125 | . 2 |
30 | phplem1 6338 | . 2 | |
31 | 26, 29, 30 | 3brtr3d 3814 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wceq 1284 wcel 1433 cvv 2601 cdif 2970 cun 2971 cin 2972 wss 2973 c0 3251 csn 3398 cop 3401 class class class wbr 3785 word 4117 csuc 4120 com 4331 wf1o 4921 cen 6242 |
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-setind 4280 ax-iinf 4329 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-ral 2353 df-rex 2354 df-rab 2357 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-op 3407 df-uni 3602 df-int 3637 df-br 3786 df-opab 3840 df-tr 3876 df-id 4048 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-en 6245 |
This theorem is referenced by: phplem3 6340 |
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