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Theorem expubnd 11011
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 1028 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> A e. RR )
2 2re 9353 . . . . 5 |- 2 e. RR
3 peano2rem 8583 . . . . 5 |- ( A e. RR -> ( A - 1 ) e. RR )
4 remulcl 8297 . . . . 5 |- ( ( 2 e. RR /\ ( A - 1 ) e. RR ) -> ( 2 x. ( A - 1 ) ) e. RR )
52, 3, 4sylancr 418 . . . 4 |- ( A e. RR -> ( 2 x. ( A - 1 ) ) e. RR )
653ad2ant1 1049 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 2 x. ( A - 1 ) ) e. RR )
7 simp2 1029 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> N e. NN0 )
8 0le2 9373 . . . . . . 7 |- 0 <_ 2
9 0re 8316 . . . . . . . 8 |- 0 e. RR
10 letr 8398 . . . . . . . 8 |- ( ( 0 e. RR /\ 2 e. RR /\ A e. RR ) -> ( ( 0 <_ 2 /\ 2 <_ A ) -> 0 <_ A ) )
119, 2, 10mp3an12 1368 . . . . . . 7 |- ( A e. RR -> ( ( 0 <_ 2 /\ 2 <_ A ) -> 0 <_ A ) )
128, 11mpani 434 . . . . . 6 |- ( A e. RR -> ( 2 <_ A -> 0 <_ A ) )
1312imp 124 . . . . 5 |- ( ( A e. RR /\ 2 <_ A ) -> 0 <_ A )
14 resubcl 8580 . . . . . . . . 9 |- ( ( A e. RR /\ 2 e. RR ) -> ( A - 2 ) e. RR )
152, 14mpan2 429 . . . . . . . 8 |- ( A e. RR -> ( A - 2 ) e. RR )
16 leadd2 8749 . . . . . . . . 9 |- ( ( 2 e. RR /\ A e. RR /\ ( A - 2 ) e. RR ) -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
172, 16mp3an1 1365 . . . . . . . 8 |- ( ( A e. RR /\ ( A - 2 ) e. RR ) -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
1815, 17mpdan 425 . . . . . . 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 8302 . . . . . . . 8 |- ( A e. RR -> A e. CC )
21 2cn 9354 . . . . . . . 8 |- 2 e. CC
22 npcan 8525 . . . . . . . 8 |- ( ( A e. CC /\ 2 e. CC ) -> ( ( A - 2 ) + 2 ) = A )
2320, 21, 22sylancl 417 . . . . . . 7 |- ( A e. RR -> ( ( A - 2 ) + 2 ) = A )
2423adantr 276 . . . . . 6 |- ( ( A e. RR /\ 2 <_ A ) -> ( ( A - 2 ) + 2 ) = A )
25 ax-1cn 8262 . . . . . . . . . 10 |- 1 e. CC
26 subdi 8702 . . . . . . . . . 10 |- ( ( 2 e. CC /\ A e. CC /\ 1 e. CC ) -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
2721, 25, 26mp3an13 1369 . . . . . . . . 9 |- ( A e. CC -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
28 2times 9411 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. A ) = ( A + A ) )
29 2t1e2 9437 . . . . . . . . . . 11 |- ( 2 x. 1 ) = 2
3029a1i 9 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. 1 ) = 2 )
3128, 30oveq12d 6093 . . . . . . . . 9 |- ( A e. CC -> ( ( 2 x. A ) - ( 2 x. 1 ) ) = ( ( A + A ) - 2 ) )
32 addsub 8527 . . . . . . . . . . 11 |- ( ( A e. CC /\ A e. CC /\ 2 e. CC ) -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3321, 32mp3an3 1367 . . . . . . . . . 10 |- ( ( A e. CC /\ A e. CC ) -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3433anidms 401 . . . . . . . . 9 |- ( A e. CC -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3527, 31, 343eqtrrd 2276 . . . . . . . 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 4156 . . . . 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 1047 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 0 <_ A /\ A <_ ( 2 x. ( A - 1 ) ) ) )
41 leexp1a 11009 . . 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 1281 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( A ^ N ) <_ ( ( 2 x. ( A - 1 ) ) ^ N ) )
433recnd 8344 . . . 4 |- ( A e. RR -> ( A - 1 ) e. CC )
44 mulexp 10993 . . . . 5 |- ( ( 2 e. CC /\ ( A - 1 ) e. CC /\ N e. NN0 ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4521, 44mp3an1 1365 . . . 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 1048 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4842, 47breqtrd 4151 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 1009   = wceq 1402   e. wcel 2209   class class class wbr 4125  (class class class)co 6075   CCcc 8167   RRcr 8168   0cc0 8169   1c1 8170   + caddc 8172   x. cmul 8174   <_ cle 8351   - cmin 8487   2c2 9334   NN0cn0 9542   ^cexp 10953
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-2 9342  df-n0 9543  df-z 9624  df-uz 9901  df-seqfrec 10863  df-exp 10954
This theorem is referenced by: (None)
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