| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: Lemma for Pigeonhole Principle. Equinumerosity of successors implies equinumerosity of the original natural numbers. |
| Ref | Expression |
|---|---|
| phplem2.1 |
|
| phplem2.2 |
|
| Ref | Expression |
|---|---|
| phplem4 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | entr 4555 |
. . . . . 6
| |
| 2 | f1of1 3796 |
. . . . . . . . . 10
| |
| 3 | sssucid 3050 |
. . . . . . . . . 10
| |
| 4 | 2, 3 | jctir 291 |
. . . . . . . . 9
|
| 5 | f1ores 3811 |
. . . . . . . . 9
| |
| 6 | phplem2.1 |
. . . . . . . . . 10
| |
| 7 | 6 | f1oen 4539 |
. . . . . . . . 9
|
| 8 | 4, 5, 7 | 3syl 20 |
. . . . . . . 8
|
| 9 | 8 | adantl 388 |
. . . . . . 7
|
| 10 | nnord 3227 |
. . . . . . . . 9
| |
| 11 | orddif 3065 |
. . . . . . . . 9
| |
| 12 | imaeq2 3492 |
. . . . . . . . 9
| |
| 13 | 10, 11, 12 | 3syl 20 |
. . . . . . . 8
|
| 14 | f1ofn 3798 |
. . . . . . . . . 10
| |
| 15 | 6 | sucid 3051 |
. . . . . . . . . . 11
|
| 16 | fnsnfv 3878 |
. . . . . . . . . . 11
| |
| 17 | 15, 16 | mpan2 700 |
. . . . . . . . . 10
|
| 18 | difeq2 2206 |
. . . . . . . . . 10
| |
| 19 | 14, 17, 18 | 3syl 20 |
. . . . . . . . 9
|
| 20 | imadmrn 3506 |
. . . . . . . . . . . . 13
| |
| 21 | 20 | eqcomi 1522 |
. . . . . . . . . . . 12
|
| 22 | 21 | a1i 8 |
. . . . . . . . . . 11
|
| 23 | f1ofo 3803 |
. . . . . . . . . . . 12
| |
| 24 | forn 3782 |
. . . . . . . . . . . 12
| |
| 25 | 23, 24 | syl 10 |
. . . . . . . . . . 11
|
| 26 | fndm 3693 |
. . . . . . . . . . . 12
| |
| 27 | imaeq2 3492 |
. . . . . . . . . . . 12
| |
| 28 | 14, 26, 27 | 3syl 20 |
. . . . . . . . . . 11
|
| 29 | 22, 25, 28 | 3eqtr3d 1558 |
. . . . . . . . . 10
|
| 30 | 29 | difeq1d 2210 |
. . . . . . . . 9
|
| 31 | dff1o3 3802 |
. . . . . . . . . . 11
| |
| 32 | 31 | pm3.27bi 324 |
. . . . . . . . . 10
|
| 33 | imadif 3679 |
. . . . . . . . . 10
| |
| 34 | 32, 33 | syl 10 |
. . . . . . . . 9
|
| 35 | 19, 30, 34 | 3eqtr4rd 1561 |
. . . . . . . 8
|
| 36 | 13, 35 | sylan9eq 1570 |
. . . . . . 7
|
| 37 | 9, 36 | breqtrd 2712 |
. . . . . 6
|
| 38 | phplem2.2 |
. . . . . . . . 9
| |
| 39 | fvex 3843 |
. . . . . . . . 9
| |
| 40 | 38, 39 | phplem3 4657 |
. . . . . . . 8
|
| 41 | fnfvelrn 3927 |
. . . . . . . . . . 11
| |
| 42 | 15, 41 | mpan2 700 |
. . . . . . . . . 10
|
| 43 | 14, 42 | syl 10 |
. . . . . . . . 9
|
| 44 | 24 | eleq2d 1584 |
. . . . . . . . . 10
|
| 45 | 23, 44 | syl 10 |
. . . . . . . . 9
|
| 46 | 43, 45 | mpbid 193 |
. . . . . . . 8
|
| 47 | 40, 46 | sylan2 453 |
. . . . . . 7
|
| 48 | 38 | sucex 3168 |
. . . . . . . . 9
|
| 49 | difss 2219 |
. . . . . . . . 9
| |
| 50 | 48, 49 | ssexi 2794 |
. . . . . . . 8
|
| 51 | 50 | ensym 4553 |
. . . . . . 7
|
| 52 | 47, 51 | syl 10 |
. . . . . 6
|
| 53 | 1, 37, 52 | syl2an 456 |
. . . . 5
|
| 54 | 53 | anandirs 516 |
. . . 4
|
| 55 | 54 | ex 371 |
. . 3
|
| 56 | 55 | 19.23adv 1251 |
. 2
|
| 57 | 48 | bren 4518 |
. 2
|
| 58 | 56, 57 | syl5ib 204 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: nneneq 4659 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-9 1001 ax-10 1002 ax-11 1003 ax-12 1004 ax-13 1005 ax-14 1006 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 ax-rep 2767 ax-sep 2777 ax-nul 2784 ax-pow 2818 ax-pr 2855 ax-un 3089 |
| This theorem depends on definitions: df-bi 145 df-or 222 df-an 223 df-3an 783 df-ex 1017 df-sb 1209 df-eu 1421 df-mo 1422 df-clab 1506 df-cleq 1511 df-clel 1514 df-ne 1630 df-ral 1695 df-rex 1696 df-v 1858 df-dif 2101 df-un 2102 df-in 2103 df-ss 2105 df-nul 2333 df-pw 2459 df-sn 2470 df-pr 2471 df-op 2474 df-uni 2570 df-br 2693 df-opab 2741 df-tr 2755 df-eprel 2910 df-id 2913 df-po 2918 df-so 2929 df-fr 2947 df-we 2962 df-ord 2978 df-on 2979 df-suc 2981 df-om 3219 df-xp 3265 df-rel 3266 df-cnv 3267 df-co 3268 df-dm 3269 df-rn 3270 df-res 3271 df-ima 3272 df-fun 3273 df-fn 3274 df-f 3275 df-f1 3276 df-fo 3277 df-f1o 3278 df-fv 3279 df-er 4401 df-en 4509 |