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Theorem expubnd 11403
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 957 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  A  e.  RR )
2 2re 10033 . . . . 5  |-  2  e.  RR
3 peano2rem 9331 . . . . 5  |-  ( A  e.  RR  ->  ( A  -  1 )  e.  RR )
4 remulcl 9039 . . . . 5  |-  ( ( 2  e.  RR  /\  ( A  -  1
)  e.  RR )  ->  ( 2  x.  ( A  -  1 ) )  e.  RR )
52, 3, 4sylancr 645 . . . 4  |-  ( A  e.  RR  ->  (
2  x.  ( A  -  1 ) )  e.  RR )
653ad2ant1 978 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
2  x.  ( A  -  1 ) )  e.  RR )
7 simp2 958 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  N  e.  NN0 )
8 0re 9055 . . . . . . . 8  |-  0  e.  RR
9 2pos 10046 . . . . . . . 8  |-  0  <  2
108, 2, 9ltleii 9160 . . . . . . 7  |-  0  <_  2
11 letr 9131 . . . . . . . 8  |-  ( ( 0  e.  RR  /\  2  e.  RR  /\  A  e.  RR )  ->  (
( 0  <_  2  /\  2  <_  A )  ->  0  <_  A
) )
128, 2, 11mp3an12 1269 . . . . . . 7  |-  ( A  e.  RR  ->  (
( 0  <_  2  /\  2  <_  A )  ->  0  <_  A
) )
1310, 12mpani 658 . . . . . 6  |-  ( A  e.  RR  ->  (
2  <_  A  ->  0  <_  A ) )
1413imp 419 . . . . 5  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
0  <_  A )
15 resubcl 9329 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  2  e.  RR )  ->  ( A  -  2 )  e.  RR )
162, 15mpan2 653 . . . . . . . 8  |-  ( A  e.  RR  ->  ( A  -  2 )  e.  RR )
17 leadd2 9461 . . . . . . . . 9  |-  ( ( 2  e.  RR  /\  A  e.  RR  /\  ( A  -  2 )  e.  RR )  -> 
( 2  <_  A  <->  ( ( A  -  2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) ) )
182, 17mp3an1 1266 . . . . . . . 8  |-  ( ( A  e.  RR  /\  ( A  -  2
)  e.  RR )  ->  ( 2  <_  A 
<->  ( ( A  - 
2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) ) )
1916, 18mpdan 650 . . . . . . 7  |-  ( A  e.  RR  ->  (
2  <_  A  <->  ( ( A  -  2 )  +  2 )  <_ 
( ( A  - 
2 )  +  A
) ) )
2019biimpa 471 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  2 )  <_  ( ( A  -  2 )  +  A ) )
21 recn 9044 . . . . . . . 8  |-  ( A  e.  RR  ->  A  e.  CC )
22 2cn 10034 . . . . . . . 8  |-  2  e.  CC
23 npcan 9278 . . . . . . . 8  |-  ( ( A  e.  CC  /\  2  e.  CC )  ->  ( ( A  - 
2 )  +  2 )  =  A )
2421, 22, 23sylancl 644 . . . . . . 7  |-  ( A  e.  RR  ->  (
( A  -  2 )  +  2 )  =  A )
2524adantr 452 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  2 )  =  A )
26 ax-1cn 9012 . . . . . . . . . 10  |-  1  e.  CC
27 subdi 9431 . . . . . . . . . 10  |-  ( ( 2  e.  CC  /\  A  e.  CC  /\  1  e.  CC )  ->  (
2  x.  ( A  -  1 ) )  =  ( ( 2  x.  A )  -  ( 2  x.  1 ) ) )
2822, 26, 27mp3an13 1270 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
2  x.  ( A  -  1 ) )  =  ( ( 2  x.  A )  -  ( 2  x.  1 ) ) )
29 2times 10063 . . . . . . . . . 10  |-  ( A  e.  CC  ->  (
2  x.  A )  =  ( A  +  A ) )
3022mulid1i 9056 . . . . . . . . . . 11  |-  ( 2  x.  1 )  =  2
3130a1i 11 . . . . . . . . . 10  |-  ( A  e.  CC  ->  (
2  x.  1 )  =  2 )
3229, 31oveq12d 6066 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
( 2  x.  A
)  -  ( 2  x.  1 ) )  =  ( ( A  +  A )  - 
2 ) )
33 addsub 9280 . . . . . . . . . . 11  |-  ( ( A  e.  CC  /\  A  e.  CC  /\  2  e.  CC )  ->  (
( A  +  A
)  -  2 )  =  ( ( A  -  2 )  +  A ) )
3422, 33mp3an3 1268 . . . . . . . . . 10  |-  ( ( A  e.  CC  /\  A  e.  CC )  ->  ( ( A  +  A )  -  2 )  =  ( ( A  -  2 )  +  A ) )
3534anidms 627 . . . . . . . . 9  |-  ( A  e.  CC  ->  (
( A  +  A
)  -  2 )  =  ( ( A  -  2 )  +  A ) )
3628, 32, 353eqtrrd 2449 . . . . . . . 8  |-  ( A  e.  CC  ->  (
( A  -  2 )  +  A )  =  ( 2  x.  ( A  -  1 ) ) )
3721, 36syl 16 . . . . . . 7  |-  ( A  e.  RR  ->  (
( A  -  2 )  +  A )  =  ( 2  x.  ( A  -  1 ) ) )
3837adantr 452 . . . . . 6  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( ( A  - 
2 )  +  A
)  =  ( 2  x.  ( A  - 
1 ) ) )
3920, 25, 383brtr3d 4209 . . . . 5  |-  ( ( A  e.  RR  /\  2  <_  A )  ->  A  <_  ( 2  x.  ( A  -  1 ) ) )
4014, 39jca 519 . . . 4  |-  ( ( A  e.  RR  /\  2  <_  A )  -> 
( 0  <_  A  /\  A  <_  ( 2  x.  ( A  - 
1 ) ) ) )
41403adant2 976 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
0  <_  A  /\  A  <_  ( 2  x.  ( A  -  1 ) ) ) )
42 leexp1a 11401 . . 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 1187 . 2  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  ( A ^ N )  <_ 
( ( 2  x.  ( A  -  1 ) ) ^ N
) )
443recnd 9078 . . . 4  |-  ( A  e.  RR  ->  ( A  -  1 )  e.  CC )
45 mulexp 11382 . . . . 5  |-  ( ( 2  e.  CC  /\  ( A  -  1
)  e.  CC  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
4622, 45mp3an1 1266 . . . 4  |-  ( ( ( A  -  1 )  e.  CC  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
4744, 46sylan 458 . . 3  |-  ( ( A  e.  RR  /\  N  e.  NN0 )  -> 
( ( 2  x.  ( A  -  1 ) ) ^ N
)  =  ( ( 2 ^ N )  x.  ( ( A  -  1 ) ^ N ) ) )
48473adant3 977 . 2  |-  ( ( A  e.  RR  /\  N  e.  NN0  /\  2  <_  A )  ->  (
( 2  x.  ( A  -  1 ) ) ^ N )  =  ( ( 2 ^ N )  x.  ( ( A  - 
1 ) ^ N
) ) )
4943, 48breqtrd 4204 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 177    /\ wa 359    /\ w3a 936    = wceq 1649    e. wcel 1721   class class class wbr 4180  (class class class)co 6048   CCcc 8952   RRcr 8953   0cc0 8954   1c1 8955    + caddc 8957    x. cmul 8959    <_ cle 9085    - cmin 9255   2c2 10013   NN0cn0 10185   ^cexp 11345
This theorem is referenced by:  faclbnd4lem1  11547
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-13 1723  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2393  ax-sep 4298  ax-nul 4306  ax-pow 4345  ax-pr 4371  ax-un 4668  ax-cnex 9010  ax-resscn 9011  ax-1cn 9012  ax-icn 9013  ax-addcl 9014  ax-addrcl 9015  ax-mulcl 9016  ax-mulrcl 9017  ax-mulcom 9018  ax-addass 9019  ax-mulass 9020  ax-distr 9021  ax-i2m1 9022  ax-1ne0 9023  ax-1rid 9024  ax-rnegex 9025  ax-rrecex 9026  ax-cnre 9027  ax-pre-lttri 9028  ax-pre-lttrn 9029  ax-pre-ltadd 9030  ax-pre-mulgt0 9031
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2266  df-mo 2267  df-clab 2399  df-cleq 2405  df-clel 2408  df-nfc 2537  df-ne 2577  df-nel 2578  df-ral 2679  df-rex 2680  df-reu 2681  df-rab 2683  df-v 2926  df-sbc 3130  df-csb 3220  df-dif 3291  df-un 3293  df-in 3295  df-ss 3302  df-pss 3304  df-nul 3597  df-if 3708  df-pw 3769  df-sn 3788  df-pr 3789  df-tp 3790  df-op 3791  df-uni 3984  df-iun 4063  df-br 4181  df-opab 4235  df-mpt 4236  df-tr 4271  df-eprel 4462  df-id 4466  df-po 4471  df-so 4472  df-fr 4509  df-we 4511  df-ord 4552  df-on 4553  df-lim 4554  df-suc 4555  df-om 4813  df-xp 4851  df-rel 4852  df-cnv 4853  df-co 4854  df-dm 4855  df-rn 4856  df-res 4857  df-ima 4858  df-iota 5385  df-fun 5423  df-fn 5424  df-f 5425  df-f1 5426  df-fo 5427  df-f1o 5428  df-fv 5429  df-ov 6051  df-oprab 6052  df-mpt2 6053  df-2nd 6317  df-riota 6516  df-recs 6600  df-rdg 6635  df-er 6872  df-en 7077  df-dom 7078  df-sdom 7079  df-pnf 9086  df-mnf 9087  df-xr 9088  df-ltxr 9089  df-le 9090  df-sub 9257  df-neg 9258  df-nn 9965  df-2 10022  df-n0 10186  df-z 10247  df-uz 10453  df-seq 11287  df-exp 11346
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