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Theorem expubnd 11162
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 955 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  A  e.  RR )
2 2re 9815 . . . . 5  |-  2  e.  RR
3 peano2rem 9113 . . . . 5  |-  ( A  e.  RR  ->  ( A  -  1 )  e.  RR )
4 remulcl 8822 . . . . 5  |-  ( ( 2  e.  RR  /\  ( A  -  1
)  e.  RR )  ->  ( 2  x.  ( A  -  1 ) )  e.  RR )
52, 3, 4sylancr 644 . . . 4  |-  ( A  e.  RR  ->  (
2  x.  ( A  -  1 ) )  e.  RR )
653ad2ant1 976 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
2  x.  ( A  -  1 ) )  e.  RR )
7 simp2 956 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  N  e.  NN0 )
8 0re 8838 . . . . . . . 8  |-  0  e.  RR
9 2pos 9828 . . . . . . . 8  |-  0  <  2
108, 2, 9ltleii 8941 . . . . . . 7  |-  0  <_  2
11 letr 8914 . . . . . . . 8  |-  ( ( 0  e.  RR  /\  2  e.  RR  /\  A  e.  RR )  ->  (
( 0  <_  2  /\  2  <_  A )  ->  0  <_  A
) )
128, 2, 11mp3an12 1267 . . . . . . 7  |-  ( A  e.  RR  ->  (
( 0  <_  2  /\  2  <_  A )  ->  0  <_  A
) )
1310, 12mpani 657 . . . . . 6  |-  ( A  e.  RR  ->  (
2  <_  A  ->  0  <_  A ) )
1413imp 418 . . . . 5  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
0  <_  A )
15 resubcl 9111 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  2  e.  RR )  ->  ( A  -  2 )  e.  RR )
162, 15mpan2 652 . . . . . . . 8  |-  ( A  e.  RR  ->  ( A  -  2 )  e.  RR )
17 leadd2 9243 . . . . . . . . 9  |-  ( ( 2  e.  RR  /\  A  e.  RR  /\  ( A  -  2 )  e.  RR )  -> 
( 2  <_  A  <->  ( ( A  -  2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) ) )
182, 17mp3an1 1264 . . . . . . . 8  |-  ( ( A  e.  RR  /\  ( A  -  2
)  e.  RR )  ->  ( 2  <_  A 
<->  ( ( A  - 
2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) ) )
1916, 18mpdan 649 . . . . . . 7  |-  ( A  e.  RR  ->  (
2  <_  A  <->  ( ( A  -  2 )  +  2 )  <_ 
( ( A  - 
2 )  +  A
) ) )
2019biimpa 470 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) )
21 recn 8827 . . . . . . . 8  |-  ( A  e.  RR  ->  A  e.  CC )
22 2cn 9816 . . . . . . . 8  |-  2  e.  CC
23 npcan 9060 . . . . . . . 8  |-  ( ( A  e.  CC  /\  2  e.  CC )  ->  ( ( A  - 
2 )  +  2 )  =  A )
2421, 22, 23sylancl 643 . . . . . . 7  |-  ( A  e.  RR  ->  (
( A  -  2 )  +  2 )  =  A )
2524adantr 451 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  2 )  =  A )
26 ax-1cn 8795 . . . . . . . . . 10  |-  1  e.  CC
27 subdi 9213 . . . . . . . . . 10  |-  ( ( 2  e.  CC  /\  A  e.  CC  /\  1  e.  CC )  ->  (
2  x.  ( A  -  1 ) )  =  ( ( 2  x.  A )  -  ( 2  x.  1 ) ) )
2822, 26, 27mp3an13 1268 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
2  x.  ( A  -  1 ) )  =  ( ( 2  x.  A )  -  ( 2  x.  1 ) ) )
29 2times 9843 . . . . . . . . . 10  |-  ( A  e.  CC  ->  (
2  x.  A )  =  ( A  +  A ) )
3022mulid1i 8839 . . . . . . . . . . 11  |-  ( 2  x.  1 )  =  2
3130a1i 10 . . . . . . . . . 10  |-  ( A  e.  CC  ->  (
2  x.  1 )  =  2 )
3229, 31oveq12d 5876 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
( 2  x.  A
)  -  ( 2  x.  1 ) )  =  ( ( A  +  A )  - 
2 ) )
33 addsub 9062 . . . . . . . . . . 11  |-  ( ( A  e.  CC  /\  A  e.  CC  /\  2  e.  CC )  ->  (
( A  +  A
)  -  2 )  =  ( ( A  -  2 )  +  A ) )
3422, 33mp3an3 1266 . . . . . . . . . 10  |-  ( ( A  e.  CC  /\  A  e.  CC )  ->  ( ( A  +  A )  -  2 )  =  ( ( A  -  2 )  +  A ) )
3534anidms 626 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
( A  +  A
)  -  2 )  =  ( ( A  -  2 )  +  A ) )
3628, 32, 353eqtrrd 2320 . . . . . . . 8  |-  ( A  e.  CC  ->  (
( A  -  2 )  +  A )  =  ( 2  x.  ( A  -  1 ) ) )
3721, 36syl 15 . . . . . . 7  |-  ( A  e.  RR  ->  (
( A  -  2 )  +  A )  =  ( 2  x.  ( A  -  1 ) ) )
3837adantr 451 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  A
)  =  ( 2  x.  ( A  - 
1 ) ) )
3920, 25, 383brtr3d 4052 . . . . 5  |-  ( ( A  e.  RR  /\  2  <_  A )  ->  A  <_  ( 2  x.  ( A  -  1 ) ) )
4014, 39jca 518 . . . 4  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( 0  <_  A  /\  A  <_  ( 2  x.  ( A  - 
1 ) ) ) )
41403adant2 974 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
0  <_  A  /\  A  <_  ( 2  x.  ( A  -  1 ) ) ) )
42 leexp1a 11160 . . 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 ) )
431, 6, 7, 41, 42syl31anc 1185 . 2  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  ( A ^ N )  <_ 
( ( 2  x.  ( A  -  1 ) ) ^ N
) )
443recnd 8861 . . . 4  |-  ( A  e.  RR  ->  ( A  -  1 )  e.  CC )
45 mulexp 11141 . . . . 5  |-  ( ( 2  e.  CC  /\  ( A  -  1
)  e.  CC  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
4622, 45mp3an1 1264 . . . 4  |-  ( ( ( A  -  1 )  e.  CC  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
4744, 46sylan 457 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
48473adant3 975 . 2  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
( 2  x.  ( A  -  1 ) ) ^ N )  =  ( ( 2 ^ N )  x.  ( ( A  - 
1 ) ^ N
) ) )
4943, 48breqtrd 4047 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    <-> wb 176    /\ wa 358    /\ w3a 934    = wceq 1623    e. wcel 1684   class class class wbr 4023  (class class class)co 5858   CCcc 8735   RRcr 8736   0cc0 8737   1c1 8738    + caddc 8740    x. cmul 8742    <_ cle 8868    - cmin 9037   2c2 9795   NN0cn0 9965   ^cexp 11104
This theorem is referenced by:  faclbnd4lem1  11306
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-cnex 8793  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-tr 4114  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-we 4354  df-ord 4395  df-on 4396  df-lim 4397  df-suc 4398  df-om 4657  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-2nd 6123  df-riota 6304  df-recs 6388  df-rdg 6423  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040  df-nn 9747  df-2 9804  df-n0 9966  df-z 10025  df-uz 10231  df-seq 11047  df-exp 11105
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