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| 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 | entrt 4395 |
. . . . . 6
| |
| 2 | f1of1 3673 |
. . . . . . . . . 10
| |
| 3 | sssucid 3037 |
. . . . . . . . . 10
| |
| 4 | 2, 3 | jctir 293 |
. . . . . . . . 9
|
| 5 | f1ores 3688 |
. . . . . . . . 9
| |
| 6 | phplem2.1 |
. . . . . . . . . 10
| |
| 7 | 6 | f1oen 4379 |
. . . . . . . . 9
|
| 8 | 4, 5, 7 | 3syl 20 |
. . . . . . . 8
|
| 9 | 8 | adantl 388 |
. . . . . . 7
|
| 10 | nnord 3130 |
. . . . . . . . 9
| |
| 11 | orddif 3065 |
. . . . . . . . 9
| |
| 12 | imaeq2 3386 |
. . . . . . . . 9
| |
| 13 | 10, 11, 12 | 3syl 20 |
. . . . . . . 8
|
| 14 | f1ofn 3675 |
. . . . . . . . . 10
| |
| 15 | 6 | sucid 3041 |
. . . . . . . . . . 11
|
| 16 | fnsnfv 3752 |
. . . . . . . . . . 11
| |
| 17 | 15, 16 | mpan2 694 |
. . . . . . . . . 10
|
| 18 | difeq2 2144 |
. . . . . . . . . 10
| |
| 19 | 14, 17, 18 | 3syl 20 |
. . . . . . . . 9
|
| 20 | imadmrn 3398 |
. . . . . . . . . . . . 13
| |
| 21 | 20 | eqcomi 1471 |
. . . . . . . . . . . 12
|
| 22 | 21 | a1i 8 |
. . . . . . . . . . 11
|
| 23 | f1ofo 3680 |
. . . . . . . . . . . 12
| |
| 24 | forn 3659 |
. . . . . . . . . . . 12
| |
| 25 | 23, 24 | syl 10 |
. . . . . . . . . . 11
|
| 26 | fndm 3573 |
. . . . . . . . . . . 12
| |
| 27 | imaeq2 3386 |
. . . . . . . . . . . 12
| |
| 28 | 14, 26, 27 | 3syl 20 |
. . . . . . . . . . 11
|
| 29 | 22, 25, 28 | 3eqtr3d 1507 |
. . . . . . . . . 10
|
| 30 | 29 | difeq1d 2148 |
. . . . . . . . 9
|
| 31 | f1o3 3679 |
. . . . . . . . . . 11
| |
| 32 | 31 | pm3.27bi 326 |
. . . . . . . . . 10
|
| 33 | imadif 3560 |
. . . . . . . . . 10
| |
| 34 | 32, 33 | syl 10 |
. . . . . . . . 9
|
| 35 | 19, 30, 34 | 3eqtr4rd 1510 |
. . . . . . . 8
|
| 36 | 13, 35 | sylan9eq 1519 |
. . . . . . 7
|
| 37 | 9, 36 | breqtrd 2629 |
. . . . . 6
|
| 38 | phplem2.2 |
. . . . . . . . 9
| |
| 39 | fvex 3717 |
. . . . . . . . 9
| |
| 40 | 38, 39 | phplem3 4490 |
. . . . . . . 8
|
| 41 | fnfvelrn 3798 |
. . . . . . . . . . 11
| |
| 42 | 15, 41 | mpan2 694 |
. . . . . . . . . 10
|
| 43 | 14, 42 | syl 10 |
. . . . . . . . 9
|
| 44 | 24 | eleq2d 1533 |
. . . . . . . . . 10
|
| 45 | 23, 44 | syl 10 |
. . . . . . . . 9
|
| 46 | 43, 45 | mpbid 195 |
. . . . . . . 8
|
| 47 | 40, 46 | sylan2 451 |
. . . . . . 7
|
| 48 | 38 | sucex 3040 |
. . . . . . . . 9
|
| 49 | difss 2157 |
. . . . . . . . 9
| |
| 50 | 48, 49 | ssexi 2710 |
. . . . . . . 8
|
| 51 | 50 | ensym 4393 |
. . . . . . 7
|
| 52 | 47, 51 | syl 10 |
. . . . . 6
|
| 53 | 1, 37, 52 | syl2an 454 |
. . . . 5
|
| 54 | 53 | anandirs 512 |
. . . 4
|
| 55 | 54 | ex 373 |
. . 3
|
| 56 | 55 | 19.23adv 1209 |
. 2
|
| 57 | 48 | bren 4359 |
. 2
|
| 58 | 56, 57 | syl5ib 206 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: nneneq 4492 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-rep 2683 ax-sep 2693 ax-nul 2700 ax-pow 2732 ax-pr 2769 ax-un 2857 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-tr 2671 df-eprel 2821 df-id 2824 df-po 2831 df-so 2841 df-fr 2907 df-we 2924 df-ord 2941 df-on 2942 df-suc 2944 df-om 3122 df-xp 3174 df-rel 3175 df-cnv 3176 df-co 3177 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fun 3182 df-fn 3183 df-f 3184 df-f1 3185 df-fo 3186 df-f1o 3187 df-fv 3188 df-er 4245 df-en 4351 |