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| Mirrors > Home > ILE Home > Th. List > faclbnd3 | Unicode version | ||
| Description: A lower bound for the factorial function. (Contributed by NM, 19-Dec-2005.) |
| Ref | Expression |
|---|---|
| faclbnd3 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elnn0 9371 |
. 2
| |
| 2 | nnre 9117 |
. . . . . 6
| |
| 3 | 2 | adantr 276 |
. . . . 5
|
| 4 | nnge1 9133 |
. . . . . 6
| |
| 5 | 4 | adantr 276 |
. . . . 5
|
| 6 | nn0z 9466 |
. . . . . . 7
| |
| 7 | 6 | adantl 277 |
. . . . . 6
|
| 8 | uzid 9736 |
. . . . . 6
| |
| 9 | peano2uz 9778 |
. . . . . 6
| |
| 10 | 7, 8, 9 | 3syl 17 |
. . . . 5
|
| 11 | 3, 5, 10 | leexp2ad 10924 |
. . . 4
|
| 12 | nnnn0 9376 |
. . . . 5
| |
| 13 | faclbnd 10963 |
. . . . 5
| |
| 14 | 12, 13 | sylan 283 |
. . . 4
|
| 15 | nn0re 9378 |
. . . . . . 7
| |
| 16 | reexpcl 10778 |
. . . . . . 7
| |
| 17 | 15, 16 | sylan 283 |
. . . . . 6
|
| 18 | peano2nn0 9409 |
. . . . . . 7
| |
| 19 | reexpcl 10778 |
. . . . . . 7
| |
| 20 | 15, 18, 19 | syl2an 289 |
. . . . . 6
|
| 21 | reexpcl 10778 |
. . . . . . . 8
| |
| 22 | 15, 21 | mpancom 422 |
. . . . . . 7
|
| 23 | faccl 10957 |
. . . . . . . 8
| |
| 24 | 23 | nnred 9123 |
. . . . . . 7
|
| 25 | remulcl 8127 |
. . . . . . 7
| |
| 26 | 22, 24, 25 | syl2an 289 |
. . . . . 6
|
| 27 | letr 8229 |
. . . . . 6
| |
| 28 | 17, 20, 26, 27 | syl3anc 1271 |
. . . . 5
|
| 29 | 12, 28 | sylan 283 |
. . . 4
|
| 30 | 11, 14, 29 | mp2and 433 |
. . 3
|
| 31 | elnn0 9371 |
. . . . . . 7
| |
| 32 | 0exp 10796 |
. . . . . . . . 9
| |
| 33 | 0le1 8628 |
. . . . . . . . 9
| |
| 34 | 32, 33 | eqbrtrdi 4122 |
. . . . . . . 8
|
| 35 | oveq2 6009 |
. . . . . . . . 9
| |
| 36 | 0exp0e1 10766 |
. . . . . . . . . 10
| |
| 37 | 1le1 8719 |
. . . . . . . . . 10
| |
| 38 | 36, 37 | eqbrtri 4104 |
. . . . . . . . 9
|
| 39 | 35, 38 | eqbrtrdi 4122 |
. . . . . . . 8
|
| 40 | 34, 39 | jaoi 721 |
. . . . . . 7
|
| 41 | 31, 40 | sylbi 121 |
. . . . . 6
|
| 42 | 1nn 9121 |
. . . . . . . 8
| |
| 43 | nnmulcl 9131 |
. . . . . . . 8
| |
| 44 | 42, 23, 43 | sylancr 414 |
. . . . . . 7
|
| 45 | 44 | nnge1d 9153 |
. . . . . 6
|
| 46 | 0re 8146 |
. . . . . . . 8
| |
| 47 | reexpcl 10778 |
. . . . . . . 8
| |
| 48 | 46, 47 | mpan 424 |
. . . . . . 7
|
| 49 | 1re 8145 |
. . . . . . . 8
| |
| 50 | remulcl 8127 |
. . . . . . . 8
| |
| 51 | 49, 24, 50 | sylancr 414 |
. . . . . . 7
|
| 52 | letr 8229 |
. . . . . . . 8
| |
| 53 | 49, 52 | mp3an2 1359 |
. . . . . . 7
|
| 54 | 48, 51, 53 | syl2anc 411 |
. . . . . 6
|
| 55 | 41, 45, 54 | mp2and 433 |
. . . . 5
|
| 56 | 55 | adantl 277 |
. . . 4
|
| 57 | oveq1 6008 |
. . . . . 6
| |
| 58 | oveq12 6010 |
. . . . . . . . 9
| |
| 59 | 58 | anidms 397 |
. . . . . . . 8
|
| 60 | 59, 36 | eqtrdi 2278 |
. . . . . . 7
|
| 61 | 60 | oveq1d 6016 |
. . . . . 6
|
| 62 | 57, 61 | breq12d 4096 |
. . . . 5
|
| 63 | 62 | adantr 276 |
. . . 4
|
| 64 | 56, 63 | mpbird 167 |
. . 3
|
| 65 | 30, 64 | jaoian 800 |
. 2
|
| 66 | 1, 65 | sylanb 284 |
1
|
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-nul 4210 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-iinf 4680 ax-cnex 8090 ax-resscn 8091 ax-1cn 8092 ax-1re 8093 ax-icn 8094 ax-addcl 8095 ax-addrcl 8096 ax-mulcl 8097 ax-mulrcl 8098 ax-addcom 8099 ax-mulcom 8100 ax-addass 8101 ax-mulass 8102 ax-distr 8103 ax-i2m1 8104 ax-0lt1 8105 ax-1rid 8106 ax-0id 8107 ax-rnegex 8108 ax-precex 8109 ax-cnre 8110 ax-pre-ltirr 8111 ax-pre-ltwlin 8112 ax-pre-lttrn 8113 ax-pre-apti 8114 ax-pre-ltadd 8115 ax-pre-mulgt0 8116 ax-pre-mulext 8117 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-if 3603 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-tr 4183 df-id 4384 df-po 4387 df-iso 4388 df-iord 4457 df-on 4459 df-ilim 4460 df-suc 4462 df-iom 4683 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-f1 5323 df-fo 5324 df-f1o 5325 df-fv 5326 df-riota 5954 df-ov 6004 df-oprab 6005 df-mpo 6006 df-1st 6286 df-2nd 6287 df-recs 6451 df-frec 6537 df-pnf 8183 df-mnf 8184 df-xr 8185 df-ltxr 8186 df-le 8187 df-sub 8319 df-neg 8320 df-reap 8722 df-ap 8729 df-div 8820 df-inn 9111 df-n0 9370 df-z 9447 df-uz 9723 df-rp 9850 df-seqfrec 10670 df-exp 10761 df-fac 10948 |
| This theorem is referenced by: (None) |
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