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Theorem expubnd 10982
Description: An upper bound on A ^ N when 2 <_ A. (Contributed by NM, 19-Dec-2005.)
Assertion
Ref Expression
expubnd |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( A ^ N ) <_ ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
Proof of Theorem expubnd
StepHypRef Expression
1 simp1 1024 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> A e. RR )
2 2re 9324 . . . . 5 |- 2 e. RR
3 peano2rem 8556 . . . . 5 |- ( A e. RR -> ( A - 1 ) e. RR )
4 remulcl 8271 . . . . 5 |- ( ( 2 e. RR /\ ( A - 1 ) e. RR ) -> ( 2 x. ( A - 1 ) ) e. RR )
52, 3, 4sylancr 414 . . . 4 |- ( A e. RR -> ( 2 x. ( A - 1 ) ) e. RR )
653ad2ant1 1045 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 2 x. ( A - 1 ) ) e. RR )
7 simp2 1025 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> N e. NN0 )
8 0le2 9344 . . . . . . 7 |- 0 <_ 2
9 0re 8290 . . . . . . . 8 |- 0 e. RR
10 letr 8372 . . . . . . . 8 |- ( ( 0 e. RR /\ 2 e. RR /\ A e. RR ) -> ( ( 0 <_ 2 /\ 2 <_ A ) -> 0 <_ A ) )
119, 2, 10mp3an12 1364 . . . . . . 7 |- ( A e. RR -> ( ( 0 <_ 2 /\ 2 <_ A ) -> 0 <_ A ) )
128, 11mpani 430 . . . . . 6 |- ( A e. RR -> ( 2 <_ A -> 0 <_ A ) )
1312imp 124 . . . . 5 |- ( ( A e. RR /\ 2 <_ A ) -> 0 <_ A )
14 resubcl 8553 . . . . . . . . 9 |- ( ( A e. RR /\ 2 e. RR ) -> ( A - 2 ) e. RR )
152, 14mpan2 425 . . . . . . . 8 |- ( A e. RR -> ( A - 2 ) e. RR )
16 leadd2 8722 . . . . . . . . 9 |- ( ( 2 e. RR /\ A e. RR /\ ( A - 2 ) e. RR ) -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
172, 16mp3an1 1361 . . . . . . . 8 |- ( ( A e. RR /\ ( A - 2 ) e. RR ) -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
1815, 17mpdan 421 . . . . . . 7 |- ( A e. RR -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
1918biimpa 296 . . . . . 6 |- ( ( A e. RR /\ 2 <_ A ) -> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) )
20 recn 8276 . . . . . . . 8 |- ( A e. RR -> A e. CC )
21 2cn 9325 . . . . . . . 8 |- 2 e. CC
22 npcan 8498 . . . . . . . 8 |- ( ( A e. CC /\ 2 e. CC ) -> ( ( A - 2 ) + 2 ) = A )
2320, 21, 22sylancl 413 . . . . . . 7 |- ( A e. RR -> ( ( A - 2 ) + 2 ) = A )
2423adantr 276 . . . . . 6 |- ( ( A e. RR /\ 2 <_ A ) -> ( ( A - 2 ) + 2 ) = A )
25 ax-1cn 8236 . . . . . . . . . 10 |- 1 e. CC
26 subdi 8675 . . . . . . . . . 10 |- ( ( 2 e. CC /\ A e. CC /\ 1 e. CC ) -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
2721, 25, 26mp3an13 1365 . . . . . . . . 9 |- ( A e. CC -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
28 2times 9382 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. A ) = ( A + A ) )
29 2t1e2 9408 . . . . . . . . . . 11 |- ( 2 x. 1 ) = 2
3029a1i 9 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. 1 ) = 2 )
3128, 30oveq12d 6076 . . . . . . . . 9 |- ( A e. CC -> ( ( 2 x. A ) - ( 2 x. 1 ) ) = ( ( A + A ) - 2 ) )
32 addsub 8500 . . . . . . . . . . 11 |- ( ( A e. CC /\ A e. CC /\ 2 e. CC ) -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3321, 32mp3an3 1363 . . . . . . . . . 10 |- ( ( A e. CC /\ A e. CC ) -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3433anidms 397 . . . . . . . . 9 |- ( A e. CC -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3527, 31, 343eqtrrd 2272 . . . . . . . 8 |- ( A e. CC -> ( ( A - 2 ) + A ) = ( 2 x. ( A - 1 ) ) )
3620, 35syl 14 . . . . . . 7 |- ( A e. RR -> ( ( A - 2 ) + A ) = ( 2 x. ( A - 1 ) ) )
3736adantr 276 . . . . . 6 |- ( ( A e. RR /\ 2 <_ A ) -> ( ( A - 2 ) + A ) = ( 2 x. ( A - 1 ) ) )
3819, 24, 373brtr3d 4145 . . . . 5 |- ( ( A e. RR /\ 2 <_ A ) -> A <_ ( 2 x. ( A - 1 ) ) )
3913, 38jca 306 . . . 4 |- ( ( A e. RR /\ 2 <_ A ) -> ( 0 <_ A /\ A <_ ( 2 x. ( A - 1 ) ) ) )
40393adant2 1043 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 0 <_ A /\ A <_ ( 2 x. ( A - 1 ) ) ) )
41 leexp1a 10980 . . 3 |- ( ( ( A e. RR /\ ( 2 x. ( A - 1 ) ) e. RR /\ N e. NN0 ) /\ ( 0 <_ A /\ A <_ ( 2 x. ( A - 1 ) ) ) ) -> ( A ^ N ) <_ ( ( 2 x. ( A - 1 ) ) ^ N ) )
421, 6, 7, 40, 41syl31anc 1277 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( A ^ N ) <_ ( ( 2 x. ( A - 1 ) ) ^ N ) )
433recnd 8318 . . . 4 |- ( A e. RR -> ( A - 1 ) e. CC )
44 mulexp 10964 . . . . 5 |- ( ( 2 e. CC /\ ( A - 1 ) e. CC /\ N e. NN0 ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4521, 44mp3an1 1361 . . . 4 |- ( ( ( A - 1 ) e. CC /\ N e. NN0 ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4643, 45sylan 283 . . 3 |- ( ( A e. RR /\ N e. NN0 ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
47463adant3 1044 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4842, 47breqtrd 4140 1 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( A ^ N ) <_ ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
Colors of variables: wff set class
Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   e. wcel 2205   class class class wbr 4114  (class class class)co 6058   CCcc 8141   RRcr 8142   0cc0 8143   1c1 8144   + caddc 8146   x. cmul 8148   <_ cle 8325   - cmin 8460   2c2 9305   NN0cn0 9513   ^cexp 10924
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-mulrcl 8242  ax-addcom 8243  ax-mulcom 8244  ax-addass 8245  ax-mulass 8246  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-1rid 8250  ax-0id 8251  ax-rnegex 8252  ax-precex 8253  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-apti 8258  ax-pre-ltadd 8259  ax-pre-mulgt0 8260  ax-pre-mulext 8261
This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-po 4422  df-iso 4423  df-iord 4492  df-on 4494  df-ilim 4495  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-1st 6347  df-2nd 6348  df-recs 6549  df-frec 6635  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-reap 8866  df-ap 8873  df-div 8964  df-inn 9255  df-2 9313  df-n0 9514  df-z 9595  df-uz 9872  df-seqfrec 10834  df-exp 10925
This theorem is referenced by: (None)
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