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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 |
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phplem2.2 |
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Ref | Expression |
---|---|
phplem2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | phplem2.2 |
. . . . . . . 8
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2 | phplem2.1 |
. . . . . . . 8
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3 | 1, 2 | opex 4229 |
. . . . . . 7
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4 | 3 | snex 4185 |
. . . . . 6
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5 | 1, 2 | f1osn 5501 |
. . . . . 6
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6 | f1oen3g 6753 |
. . . . . 6
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7 | 4, 5, 6 | mp2an 426 |
. . . . 5
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8 | difss 3261 |
. . . . . . 7
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9 | 2, 8 | ssexi 4141 |
. . . . . 6
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10 | 9 | enref 6764 |
. . . . 5
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11 | 7, 10 | pm3.2i 272 |
. . . 4
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12 | incom 3327 |
. . . . . 6
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13 | ssrin 3360 |
. . . . . . . . 9
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14 | 8, 13 | ax-mp 5 |
. . . . . . . 8
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15 | nnord 4611 |
. . . . . . . . 9
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16 | orddisj 4545 |
. . . . . . . . 9
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17 | 15, 16 | syl 14 |
. . . . . . . 8
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18 | 14, 17 | sseqtrid 3205 |
. . . . . . 7
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19 | ss0 3463 |
. . . . . . 7
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20 | 18, 19 | syl 14 |
. . . . . 6
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21 | 12, 20 | eqtrid 2222 |
. . . . 5
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
22 | disjdif 3495 |
. . . . 5
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
23 | 21, 22 | jctil 312 |
. . . 4
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24 | unen 6815 |
. . . 4
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25 | 11, 23, 24 | sylancr 414 |
. . 3
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26 | 25 | adantr 276 |
. 2
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27 | uncom 3279 |
. . 3
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28 | nndifsnid 6507 |
. . 3
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29 | 27, 28 | eqtrid 2222 |
. 2
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
30 | phplem1 6851 |
. 2
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31 | 26, 29, 30 | 3brtr3d 4034 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4121 ax-nul 4129 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-iinf 4587 |
This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-ral 2460 df-rex 2461 df-rab 2464 df-v 2739 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-int 3845 df-br 4004 df-opab 4065 df-tr 4102 df-id 4293 df-iord 4366 df-on 4368 df-suc 4371 df-iom 4590 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-rn 4637 df-res 4638 df-ima 4639 df-fun 5218 df-fn 5219 df-f 5220 df-f1 5221 df-fo 5222 df-f1o 5223 df-en 6740 |
This theorem is referenced by: phplem3 6853 |
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