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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 3966 | . . . . . . 7 |
4 | 3 | snex 3937 | . . . . . 6 |
5 | 1, 2 | f1osn 5166 | . . . . . 6 |
6 | f1oen3g 6234 | . . . . . 6 | |
7 | 4, 5, 6 | mp2an 402 | . . . . 5 |
8 | difss 3070 | . . . . . . 7 | |
9 | 2, 8 | ssexi 3895 | . . . . . 6 |
10 | 9 | enref 6245 | . . . . 5 |
11 | 7, 10 | pm3.2i 257 | . . . 4 |
12 | incom 3129 | . . . . . 6 | |
13 | ssrin 3162 | . . . . . . . . 9 | |
14 | 8, 13 | ax-mp 7 | . . . . . . . 8 |
15 | nnord 4334 | . . . . . . . . 9 | |
16 | orddisj 4270 | . . . . . . . . 9 | |
17 | 15, 16 | syl 14 | . . . . . . . 8 |
18 | 14, 17 | syl5sseq 2993 | . . . . . . 7 |
19 | ss0 3257 | . . . . . . 7 | |
20 | 18, 19 | syl 14 | . . . . . 6 |
21 | 12, 20 | syl5eq 2084 | . . . . 5 |
22 | disjdif 3296 | . . . . 5 | |
23 | 21, 22 | jctil 295 | . . . 4 |
24 | unen 6293 | . . . 4 | |
25 | 11, 23, 24 | sylancr 393 | . . 3 |
26 | 25 | adantr 261 | . 2 |
27 | uncom 3087 | . . 3 | |
28 | nndifsnid 6080 | . . 3 | |
29 | 27, 28 | syl5eq 2084 | . 2 |
30 | phplem1 6315 | . 2 | |
31 | 26, 29, 30 | 3brtr3d 3793 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wceq 1243 wcel 1393 cvv 2557 cdif 2914 cun 2915 cin 2916 wss 2917 c0 3224 csn 3375 cop 3378 class class class wbr 3764 word 4099 csuc 4102 com 4313 wf1o 4901 cen 6219 |
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-setind 4262 ax-iinf 4311 |
This theorem depends on definitions: df-bi 110 df-dc 743 df-3or 886 df-3an 887 df-tru 1246 df-fal 1249 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ne 2206 df-ral 2311 df-rex 2312 df-rab 2315 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-op 3384 df-uni 3581 df-int 3616 df-br 3765 df-opab 3819 df-tr 3855 df-id 4030 df-iord 4103 df-on 4105 df-suc 4108 df-iom 4314 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-res 4357 df-ima 4358 df-fun 4904 df-fn 4905 df-f 4906 df-f1 4907 df-fo 4908 df-f1o 4909 df-en 6222 |
This theorem is referenced by: phplem3 6317 |
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