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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 4146 | . . . . . . 7 |
4 | 3 | snex 4104 | . . . . . 6 |
5 | 1, 2 | f1osn 5400 | . . . . . 6 |
6 | f1oen3g 6641 | . . . . . 6 | |
7 | 4, 5, 6 | mp2an 422 | . . . . 5 |
8 | difss 3197 | . . . . . . 7 | |
9 | 2, 8 | ssexi 4061 | . . . . . 6 |
10 | 9 | enref 6652 | . . . . 5 |
11 | 7, 10 | pm3.2i 270 | . . . 4 |
12 | incom 3263 | . . . . . 6 | |
13 | ssrin 3296 | . . . . . . . . 9 | |
14 | 8, 13 | ax-mp 5 | . . . . . . . 8 |
15 | nnord 4520 | . . . . . . . . 9 | |
16 | orddisj 4456 | . . . . . . . . 9 | |
17 | 15, 16 | syl 14 | . . . . . . . 8 |
18 | 14, 17 | sseqtrid 3142 | . . . . . . 7 |
19 | ss0 3398 | . . . . . . 7 | |
20 | 18, 19 | syl 14 | . . . . . 6 |
21 | 12, 20 | syl5eq 2182 | . . . . 5 |
22 | disjdif 3430 | . . . . 5 | |
23 | 21, 22 | jctil 310 | . . . 4 |
24 | unen 6703 | . . . 4 | |
25 | 11, 23, 24 | sylancr 410 | . . 3 |
26 | 25 | adantr 274 | . 2 |
27 | uncom 3215 | . . 3 | |
28 | nndifsnid 6396 | . . 3 | |
29 | 27, 28 | syl5eq 2182 | . 2 |
30 | phplem1 6739 | . 2 | |
31 | 26, 29, 30 | 3brtr3d 3954 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 cvv 2681 cdif 3063 cun 3064 cin 3065 wss 3066 c0 3358 csn 3522 cop 3525 class class class wbr 3924 word 4279 csuc 4282 com 4499 wf1o 5117 cen 6625 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-rex 2420 df-rab 2423 df-v 2683 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-br 3925 df-opab 3985 df-tr 4022 df-id 4210 df-iord 4283 df-on 4285 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-en 6628 |
This theorem is referenced by: phplem3 6741 |
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