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Theorem expubnd 10857
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 1023 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> A e. RR )
2 2re 9212 . . . . 5 |- 2 e. RR
3 peano2rem 8445 . . . . 5 |- ( A e. RR -> ( A - 1 ) e. RR )
4 remulcl 8159 . . . . 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 1044 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 2 x. ( A - 1 ) ) e. RR )
7 simp2 1024 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> N e. NN0 )
8 0le2 9232 . . . . . . 7 |- 0 <_ 2
9 0re 8178 . . . . . . . 8 |- 0 e. RR
10 letr 8261 . . . . . . . 8 |- ( ( 0 e. RR /\ 2 e. RR /\ A e. RR ) -> ( ( 0 <_ 2 /\ 2 <_ A ) -> 0 <_ A ) )
119, 2, 10mp3an12 1363 . . . . . . 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 8442 . . . . . . . . 9 |- ( ( A e. RR /\ 2 e. RR ) -> ( A - 2 ) e. RR )
152, 14mpan2 425 . . . . . . . 8 |- ( A e. RR -> ( A - 2 ) e. RR )
16 leadd2 8610 . . . . . . . . 9 |- ( ( 2 e. RR /\ A e. RR /\ ( A - 2 ) e. RR ) -> ( 2 <_ A <-> ( ( A - 2 ) + 2 ) <_ ( ( A - 2 ) + A ) ) )
172, 16mp3an1 1360 . . . . . . . 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 8164 . . . . . . . 8 |- ( A e. RR -> A e. CC )
21 2cn 9213 . . . . . . . 8 |- 2 e. CC
22 npcan 8387 . . . . . . . 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 8124 . . . . . . . . . 10 |- 1 e. CC
26 subdi 8563 . . . . . . . . . 10 |- ( ( 2 e. CC /\ A e. CC /\ 1 e. CC ) -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
2721, 25, 26mp3an13 1364 . . . . . . . . 9 |- ( A e. CC -> ( 2 x. ( A - 1 ) ) = ( ( 2 x. A ) - ( 2 x. 1 ) ) )
28 2times 9270 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. A ) = ( A + A ) )
29 2t1e2 9296 . . . . . . . . . . 11 |- ( 2 x. 1 ) = 2
3029a1i 9 . . . . . . . . . 10 |- ( A e. CC -> ( 2 x. 1 ) = 2 )
3128, 30oveq12d 6035 . . . . . . . . 9 |- ( A e. CC -> ( ( 2 x. A ) - ( 2 x. 1 ) ) = ( ( A + A ) - 2 ) )
32 addsub 8389 . . . . . . . . . . 11 |- ( ( A e. CC /\ A e. CC /\ 2 e. CC ) -> ( ( A + A ) - 2 ) = ( ( A - 2 ) + A ) )
3321, 32mp3an3 1362 . . . . . . . . . 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 2269 . . . . . . . 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 4119 . . . . 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 1042 . . 3 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( 0 <_ A /\ A <_ ( 2 x. ( A - 1 ) ) ) )
41 leexp1a 10855 . . 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 1276 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( A ^ N ) <_ ( ( 2 x. ( A - 1 ) ) ^ N ) )
433recnd 8207 . . . 4 |- ( A e. RR -> ( A - 1 ) e. CC )
44 mulexp 10839 . . . . 5 |- ( ( 2 e. CC /\ ( A - 1 ) e. CC /\ N e. NN0 ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4521, 44mp3an1 1360 . . . 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 1043 . 2 |- ( ( A e. RR /\ N e. NN0 /\ 2 <_ A ) -> ( ( 2 x. ( A - 1 ) ) ^ N ) = ( ( 2 ^ N ) x. ( ( A - 1 ) ^ N ) ) )
4842, 47breqtrd 4114 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 1004   = wceq 1397   e. wcel 2202   class class class wbr 4088  (class class class)co 6017   CCcc 8029   RRcr 8030   0cc0 8031   1c1 8032   + caddc 8034   x. cmul 8036   <_ cle 8214   - cmin 8349   2c2 9193   NN0cn0 9401   ^cexp 10799
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-mulrcl 8130  ax-addcom 8131  ax-mulcom 8132  ax-addass 8133  ax-mulass 8134  ax-distr 8135  ax-i2m1 8136  ax-0lt1 8137  ax-1rid 8138  ax-0id 8139  ax-rnegex 8140  ax-precex 8141  ax-cnre 8142  ax-pre-ltirr 8143  ax-pre-ltwlin 8144  ax-pre-lttrn 8145  ax-pre-apti 8146  ax-pre-ltadd 8147  ax-pre-mulgt0 8148  ax-pre-mulext 8149
This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-po 4393  df-iso 4394  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-recs 6470  df-frec 6556  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-sub 8351  df-neg 8352  df-reap 8754  df-ap 8761  df-div 8852  df-inn 9143  df-2 9201  df-n0 9402  df-z 9479  df-uz 9755  df-seqfrec 10709  df-exp 10800
This theorem is referenced by: (None)
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