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Theorem faclbnd3 11159
Description: A lower bound for the factorial function. (Contributed by NM, 19-Dec-2005.)
Assertion
Ref Expression
faclbnd3 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
Proof of Theorem faclbnd3
StepHypRef Expression
1 elnn0 9544 . 2 |- ( M e. NN0 <-> ( M e. NN \/ M = 0 ) )
2 nnre 9290 . . . . . 6 |- ( M e. NN -> M e. RR )
32adantr 276 . . . . 5 |- ( ( M e. NN /\ N e. NN0 ) -> M e. RR )
4 nnge1 9306 . . . . . 6 |- ( M e. NN -> 1 <_ M )
54adantr 276 . . . . 5 |- ( ( M e. NN /\ N e. NN0 ) -> 1 <_ M )
6 nn0z 9643 . . . . . . 7 |- ( N e. NN0 -> N e. ZZ )
76adantl 277 . . . . . 6 |- ( ( M e. NN /\ N e. NN0 ) -> N e. ZZ )
8 uzid 9915 . . . . . 6 |- ( N e. ZZ -> N e. ( ZZ>= ` N ) )
9 peano2uz 9962 . . . . . 6 |- ( N e. ( ZZ>= ` N ) -> ( N + 1 ) e. ( ZZ>= ` N ) )
107, 8, 93syl 17 . . . . 5 |- ( ( M e. NN /\ N e. NN0 ) -> ( N + 1 ) e. ( ZZ>= ` N ) )
113, 5, 10leexp2ad 11118 . . . 4 |- ( ( M e. NN /\ N e. NN0 ) -> ( M ^ N ) <_ ( M ^ ( N + 1 ) ) )
12 nnnn0 9549 . . . . 5 |- ( M e. NN -> M e. NN0 )
13 faclbnd 11157 . . . . 5 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( M ^ ( N + 1 ) ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
1412, 13sylan 283 . . . 4 |- ( ( M e. NN /\ N e. NN0 ) -> ( M ^ ( N + 1 ) ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
15 nn0re 9551 . . . . . . 7 |- ( M e. NN0 -> M e. RR )
16 reexpcl 10971 . . . . . . 7 |- ( ( M e. RR /\ N e. NN0 ) -> ( M ^ N ) e. RR )
1715, 16sylan 283 . . . . . 6 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( M ^ N ) e. RR )
18 peano2nn0 9582 . . . . . . 7 |- ( N e. NN0 -> ( N + 1 ) e. NN0 )
19 reexpcl 10971 . . . . . . 7 |- ( ( M e. RR /\ ( N + 1 ) e. NN0 ) -> ( M ^ ( N + 1 ) ) e. RR )
2015, 18, 19syl2an 289 . . . . . 6 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( M ^ ( N + 1 ) ) e. RR )
21 reexpcl 10971 . . . . . . . 8 |- ( ( M e. RR /\ M e. NN0 ) -> ( M ^ M ) e. RR )
2215, 21mpancom 426 . . . . . . 7 |- ( M e. NN0 -> ( M ^ M ) e. RR )
23 faccl 11151 . . . . . . . 8 |- ( N e. NN0 -> ( ! ` N ) e. NN )
2423nnred 9296 . . . . . . 7 |- ( N e. NN0 -> ( ! ` N ) e. RR )
25 remulcl 8297 . . . . . . 7 |- ( ( ( M ^ M ) e. RR /\ ( ! ` N ) e. RR ) -> ( ( M ^ M ) x. ( ! ` N ) ) e. RR )
2622, 24, 25syl2an 289 . . . . . 6 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( ( M ^ M ) x. ( ! ` N ) ) e. RR )
27 letr 8398 . . . . . 6 |- ( ( ( M ^ N ) e. RR /\ ( M ^ ( N + 1 ) ) e. RR /\ ( ( M ^ M ) x. ( ! ` N ) ) e. RR ) -> ( ( ( M ^ N ) <_ ( M ^ ( N + 1 ) ) /\ ( M ^ ( N + 1 ) ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) )
2817, 20, 26, 27syl3anc 1278 . . . . 5 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( ( ( M ^ N ) <_ ( M ^ ( N + 1 ) ) /\ ( M ^ ( N + 1 ) ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) )
2912, 28sylan 283 . . . 4 |- ( ( M e. NN /\ N e. NN0 ) -> ( ( ( M ^ N ) <_ ( M ^ ( N + 1 ) ) /\ ( M ^ ( N + 1 ) ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) ) )
3011, 14, 29mp2and 437 . . 3 |- ( ( M e. NN /\ N e. NN0 ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
31 elnn0 9544 . . . . . . 7 |- ( N e. NN0 <-> ( N e. NN \/ N = 0 ) )
32 0exp 10989 . . . . . . . . 9 |- ( N e. NN -> ( 0 ^ N ) = 0 )
33 0le1 8799 . . . . . . . . 9 |- 0 <_ 1
3432, 33eqbrtrdi 4164 . . . . . . . 8 |- ( N e. NN -> ( 0 ^ N ) <_ 1 )
35 oveq2 6083 . . . . . . . . 9 |- ( N = 0 -> ( 0 ^ N ) = ( 0 ^ 0 ) )
36 0exp0e1 10959 . . . . . . . . . 10 |- ( 0 ^ 0 ) = 1
37 1le1 8890 . . . . . . . . . 10 |- 1 <_ 1
3836, 37eqbrtri 4146 . . . . . . . . 9 |- ( 0 ^ 0 ) <_ 1
3935, 38eqbrtrdi 4164 . . . . . . . 8 |- ( N = 0 -> ( 0 ^ N ) <_ 1 )
4034, 39jaoi 728 . . . . . . 7 |- ( ( N e. NN \/ N = 0 ) -> ( 0 ^ N ) <_ 1 )
4131, 40sylbi 121 . . . . . 6 |- ( N e. NN0 -> ( 0 ^ N ) <_ 1 )
42 1nn 9294 . . . . . . . 8 |- 1 e. NN
43 nnmulcl 9304 . . . . . . . 8 |- ( ( 1 e. NN /\ ( ! ` N ) e. NN ) -> ( 1 x. ( ! ` N ) ) e. NN )
4442, 23, 43sylancr 418 . . . . . . 7 |- ( N e. NN0 -> ( 1 x. ( ! ` N ) ) e. NN )
4544nnge1d 9326 . . . . . 6 |- ( N e. NN0 -> 1 <_ ( 1 x. ( ! ` N ) ) )
46 0re 8316 . . . . . . . 8 |- 0 e. RR
47 reexpcl 10971 . . . . . . . 8 |- ( ( 0 e. RR /\ N e. NN0 ) -> ( 0 ^ N ) e. RR )
4846, 47mpan 428 . . . . . . 7 |- ( N e. NN0 -> ( 0 ^ N ) e. RR )
49 1re 8315 . . . . . . . 8 |- 1 e. RR
50 remulcl 8297 . . . . . . . 8 |- ( ( 1 e. RR /\ ( ! ` N ) e. RR ) -> ( 1 x. ( ! ` N ) ) e. RR )
5149, 24, 50sylancr 418 . . . . . . 7 |- ( N e. NN0 -> ( 1 x. ( ! ` N ) ) e. RR )
52 letr 8398 . . . . . . . 8 |- ( ( ( 0 ^ N ) e. RR /\ 1 e. RR /\ ( 1 x. ( ! ` N ) ) e. RR ) -> ( ( ( 0 ^ N ) <_ 1 /\ 1 <_ ( 1 x. ( ! ` N ) ) ) -> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) ) )
5349, 52mp3an2 1366 . . . . . . 7 |- ( ( ( 0 ^ N ) e. RR /\ ( 1 x. ( ! ` N ) ) e. RR ) -> ( ( ( 0 ^ N ) <_ 1 /\ 1 <_ ( 1 x. ( ! ` N ) ) ) -> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) ) )
5448, 51, 53syl2anc 415 . . . . . 6 |- ( N e. NN0 -> ( ( ( 0 ^ N ) <_ 1 /\ 1 <_ ( 1 x. ( ! ` N ) ) ) -> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) ) )
5541, 45, 54mp2and 437 . . . . 5 |- ( N e. NN0 -> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) )
5655adantl 277 . . . 4 |- ( ( M = 0 /\ N e. NN0 ) -> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) )
57 oveq1 6082 . . . . . 6 |- ( M = 0 -> ( M ^ N ) = ( 0 ^ N ) )
58 oveq12 6084 . . . . . . . . 9 |- ( ( M = 0 /\ M = 0 ) -> ( M ^ M ) = ( 0 ^ 0 ) )
5958anidms 401 . . . . . . . 8 |- ( M = 0 -> ( M ^ M ) = ( 0 ^ 0 ) )
6059, 36eqtrdi 2287 . . . . . . 7 |- ( M = 0 -> ( M ^ M ) = 1 )
6160oveq1d 6090 . . . . . 6 |- ( M = 0 -> ( ( M ^ M ) x. ( ! ` N ) ) = ( 1 x. ( ! ` N ) ) )
6257, 61breq12d 4138 . . . . 5 |- ( M = 0 -> ( ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) <-> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) ) )
6362adantr 276 . . . 4 |- ( ( M = 0 /\ N e. NN0 ) -> ( ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) <-> ( 0 ^ N ) <_ ( 1 x. ( ! ` N ) ) ) )
6456, 63mpbird 167 . . 3 |- ( ( M = 0 /\ N e. NN0 ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
6530, 64jaoian 807 . 2 |- ( ( ( M e. NN \/ M = 0 ) /\ N e. NN0 ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
661, 65sylanb 284 1 |- ( ( M e. NN0 /\ N e. NN0 ) -> ( M ^ N ) <_ ( ( M ^ M ) x. ( ! ` N ) ) )
Colors of variables: wff set class
Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 720   = wceq 1402   e. wcel 2209   class class class wbr 4125   ` cfv 5372  (class class class)co 6075   RRcr 8168   0cc0 8169   1c1 8170   + caddc 8172   x. cmul 8174   <_ cle 8351   NNcn 9283   NN0cn0 9542   ZZcz 9623   ZZ>=cuz 9900   ^cexp 10953   !cfa 11141
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-iinf 4730  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-mulrcl 8268  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-precex 8279  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285  ax-pre-mulgt0 8286  ax-pre-mulext 8287
This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3636  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-tr 4225  df-id 4433  df-po 4436  df-iso 4437  df-iord 4506  df-on 4508  df-ilim 4509  df-suc 4511  df-iom 4733  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-recs 6566  df-frec 6652  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-reap 8893  df-ap 8900  df-div 8993  df-inn 9284  df-n0 9543  df-z 9624  df-uz 9901  df-rp 10034  df-seqfrec 10863  df-exp 10954  df-fac 11142
This theorem is referenced by: (None)
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