MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  explecnv Unicode version

Theorem explecnv 12414
Description: A sequence of terms converges to zero when it is less than powers of a number  A whose absolute value is smaller than 1. (Contributed by NM, 19-Jul-2008.) (Revised by Mario Carneiro, 26-Apr-2014.)
Hypotheses
Ref Expression
explecnv.1  |-  Z  =  ( ZZ>= `  M )
explecnv.2  |-  ( ph  ->  F  e.  V )
explecnv.3  |-  ( ph  ->  M  e.  ZZ )
explecnv.5  |-  ( ph  ->  A  e.  RR )
explecnv.4  |-  ( ph  ->  ( abs `  A
)  <  1 )
explecnv.6  |-  ( (
ph  /\  k  e.  Z )  ->  ( F `  k )  e.  CC )
explecnv.7  |-  ( (
ph  /\  k  e.  Z )  ->  ( abs `  ( F `  k ) )  <_ 
( A ^ k
) )
Assertion
Ref Expression
explecnv  |-  ( ph  ->  F  ~~>  0 )
Distinct variable groups:    A, k    ph, k    k, F    k, Z    k, M
Allowed substitution hint:    V( k)

Proof of Theorem explecnv
Dummy variable  n is distinct from all other variables.
StepHypRef Expression
1 eqid 2358 . . 3  |-  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M
) )  =  (
ZZ>= `  if ( M  <_  0 ,  0 ,  M ) )
2 0z 10124 . . . 4  |-  0  e.  ZZ
3 explecnv.3 . . . 4  |-  ( ph  ->  M  e.  ZZ )
4 ifcl 3677 . . . 4  |-  ( ( 0  e.  ZZ  /\  M  e.  ZZ )  ->  if ( M  <_ 
0 ,  0 ,  M )  e.  ZZ )
52, 3, 4sylancr 644 . . 3  |-  ( ph  ->  if ( M  <_ 
0 ,  0 ,  M )  e.  ZZ )
6 explecnv.5 . . . . 5  |-  ( ph  ->  A  e.  RR )
76recnd 8948 . . . 4  |-  ( ph  ->  A  e.  CC )
8 explecnv.4 . . . 4  |-  ( ph  ->  ( abs `  A
)  <  1 )
97, 8expcnv 12413 . . 3  |-  ( ph  ->  ( n  e.  NN0  |->  ( A ^ n ) )  ~~>  0 )
10 explecnv.1 . . . . . 6  |-  Z  =  ( ZZ>= `  M )
11 fvex 5619 . . . . . 6  |-  ( ZZ>= `  M )  e.  _V
1210, 11eqeltri 2428 . . . . 5  |-  Z  e. 
_V
1312mptex 5829 . . . 4  |-  ( n  e.  Z  |->  ( abs `  ( F `  n
) ) )  e. 
_V
1413a1i 10 . . 3  |-  ( ph  ->  ( n  e.  Z  |->  ( abs `  ( F `  n )
) )  e.  _V )
15 nn0uz 10351 . . . . . . . . . . 11  |-  NN0  =  ( ZZ>= `  0 )
1610, 15ineq12i 3444 . . . . . . . . . 10  |-  ( Z  i^i  NN0 )  =  ( ( ZZ>= `  M )  i^i  ( ZZ>= `  0 )
)
17 uzin 10349 . . . . . . . . . . 11  |-  ( ( M  e.  ZZ  /\  0  e.  ZZ )  ->  ( ( ZZ>= `  M
)  i^i  ( ZZ>= ` 
0 ) )  =  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )
183, 2, 17sylancl 643 . . . . . . . . . 10  |-  ( ph  ->  ( ( ZZ>= `  M
)  i^i  ( ZZ>= ` 
0 ) )  =  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )
1916, 18syl5req 2403 . . . . . . . . 9  |-  ( ph  ->  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) )  =  ( Z  i^i  NN0 ) )
2019eleq2d 2425 . . . . . . . 8  |-  ( ph  ->  ( k  e.  (
ZZ>= `  if ( M  <_  0 ,  0 ,  M ) )  <-> 
k  e.  ( Z  i^i  NN0 ) ) )
2120biimpa 470 . . . . . . 7  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  k  e.  ( Z  i^i  NN0 )
)
22 elin 3434 . . . . . . 7  |-  ( k  e.  ( Z  i^i  NN0 )  <->  ( k  e.  Z  /\  k  e. 
NN0 ) )
2321, 22sylib 188 . . . . . 6  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( k  e.  Z  /\  k  e.  NN0 ) )
2423simprd 449 . . . . 5  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  k  e.  NN0 )
25 oveq2 5950 . . . . . 6  |-  ( n  =  k  ->  ( A ^ n )  =  ( A ^ k
) )
26 eqid 2358 . . . . . 6  |-  ( n  e.  NN0  |->  ( A ^ n ) )  =  ( n  e. 
NN0  |->  ( A ^
n ) )
27 ovex 5967 . . . . . 6  |-  ( A ^ k )  e. 
_V
2825, 26, 27fvmpt 5682 . . . . 5  |-  ( k  e.  NN0  ->  ( ( n  e.  NN0  |->  ( A ^ n ) ) `
 k )  =  ( A ^ k
) )
2924, 28syl 15 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( (
n  e.  NN0  |->  ( A ^ n ) ) `
 k )  =  ( A ^ k
) )
306adantr 451 . . . . 5  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  A  e.  RR )
3130, 24reexpcld 11352 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( A ^ k )  e.  RR )
3229, 31eqeltrd 2432 . . 3  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( (
n  e.  NN0  |->  ( A ^ n ) ) `
 k )  e.  RR )
3323simpld 445 . . . . 5  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  k  e.  Z )
34 fveq2 5605 . . . . . . 7  |-  ( n  =  k  ->  ( F `  n )  =  ( F `  k ) )
3534fveq2d 5609 . . . . . 6  |-  ( n  =  k  ->  ( abs `  ( F `  n ) )  =  ( abs `  ( F `  k )
) )
36 eqid 2358 . . . . . 6  |-  ( n  e.  Z  |->  ( abs `  ( F `  n
) ) )  =  ( n  e.  Z  |->  ( abs `  ( F `  n )
) )
37 fvex 5619 . . . . . 6  |-  ( abs `  ( F `  k
) )  e.  _V
3835, 36, 37fvmpt 5682 . . . . 5  |-  ( k  e.  Z  ->  (
( n  e.  Z  |->  ( abs `  ( F `  n )
) ) `  k
)  =  ( abs `  ( F `  k
) ) )
3933, 38syl 15 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( (
n  e.  Z  |->  ( abs `  ( F `
 n ) ) ) `  k )  =  ( abs `  ( F `  k )
) )
40 explecnv.6 . . . . . 6  |-  ( (
ph  /\  k  e.  Z )  ->  ( F `  k )  e.  CC )
4133, 40syldan 456 . . . . 5  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( F `  k )  e.  CC )
4241abscld 12008 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( abs `  ( F `  k
) )  e.  RR )
4339, 42eqeltrd 2432 . . 3  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( (
n  e.  Z  |->  ( abs `  ( F `
 n ) ) ) `  k )  e.  RR )
44 explecnv.7 . . . . 5  |-  ( (
ph  /\  k  e.  Z )  ->  ( abs `  ( F `  k ) )  <_ 
( A ^ k
) )
4533, 44syldan 456 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( abs `  ( F `  k
) )  <_  ( A ^ k ) )
4645, 39, 293brtr4d 4132 . . 3  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  ( (
n  e.  Z  |->  ( abs `  ( F `
 n ) ) ) `  k )  <_  ( ( n  e.  NN0  |->  ( A ^ n ) ) `
 k ) )
4741absge0d 12016 . . . 4  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  0  <_  ( abs `  ( F `
 k ) ) )
4847, 39breqtrrd 4128 . . 3  |-  ( (
ph  /\  k  e.  ( ZZ>= `  if ( M  <_  0 ,  0 ,  M ) ) )  ->  0  <_  ( ( n  e.  Z  |->  ( abs `  ( F `  n )
) ) `  k
) )
491, 5, 9, 14, 32, 43, 46, 48climsqz2 12205 . 2  |-  ( ph  ->  ( n  e.  Z  |->  ( abs `  ( F `  n )
) )  ~~>  0 )
50 explecnv.2 . . 3  |-  ( ph  ->  F  e.  V )
5138adantl 452 . . 3  |-  ( (
ph  /\  k  e.  Z )  ->  (
( n  e.  Z  |->  ( abs `  ( F `  n )
) ) `  k
)  =  ( abs `  ( F `  k
) ) )
5210, 3, 50, 14, 40, 51climabs0 12149 . 2  |-  ( ph  ->  ( F  ~~>  0  <->  (
n  e.  Z  |->  ( abs `  ( F `
 n ) ) )  ~~>  0 ) )
5349, 52mpbird 223 1  |-  ( ph  ->  F  ~~>  0 )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1642    e. wcel 1710   _Vcvv 2864    i^i cin 3227   ifcif 3641   class class class wbr 4102    e. cmpt 4156   ` cfv 5334  (class class class)co 5942   CCcc 8822   RRcr 8823   0cc0 8824   1c1 8825    < clt 8954    <_ cle 8955   NN0cn0 10054   ZZcz 10113   ZZ>=cuz 10319   ^cexp 11194   abscabs 11809    ~~> cli 12048
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1930  ax-ext 2339  ax-rep 4210  ax-sep 4220  ax-nul 4228  ax-pow 4267  ax-pr 4293  ax-un 4591  ax-cnex 8880  ax-resscn 8881  ax-1cn 8882  ax-icn 8883  ax-addcl 8884  ax-addrcl 8885  ax-mulcl 8886  ax-mulrcl 8887  ax-mulcom 8888  ax-addass 8889  ax-mulass 8890  ax-distr 8891  ax-i2m1 8892  ax-1ne0 8893  ax-1rid 8894  ax-rnegex 8895  ax-rrecex 8896  ax-cnre 8897  ax-pre-lttri 8898  ax-pre-lttrn 8899  ax-pre-ltadd 8900  ax-pre-mulgt0 8901  ax-pre-sup 8902
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2213  df-mo 2214  df-clab 2345  df-cleq 2351  df-clel 2354  df-nfc 2483  df-ne 2523  df-nel 2524  df-ral 2624  df-rex 2625  df-reu 2626  df-rmo 2627  df-rab 2628  df-v 2866  df-sbc 3068  df-csb 3158  df-dif 3231  df-un 3233  df-in 3235  df-ss 3242  df-pss 3244  df-nul 3532  df-if 3642  df-pw 3703  df-sn 3722  df-pr 3723  df-tp 3724  df-op 3725  df-uni 3907  df-iun 3986  df-br 4103  df-opab 4157  df-mpt 4158  df-tr 4193  df-eprel 4384  df-id 4388  df-po 4393  df-so 4394  df-fr 4431  df-we 4433  df-ord 4474  df-on 4475  df-lim 4476  df-suc 4477  df-om 4736  df-xp 4774  df-rel 4775  df-cnv 4776  df-co 4777  df-dm 4778  df-rn 4779  df-res 4780  df-ima 4781  df-iota 5298  df-fun 5336  df-fn 5337  df-f 5338  df-f1 5339  df-fo 5340  df-f1o 5341  df-fv 5342  df-ov 5945  df-oprab 5946  df-mpt2 5947  df-2nd 6207  df-riota 6388  df-recs 6472  df-rdg 6507  df-er 6744  df-pm 6860  df-en 6949  df-dom 6950  df-sdom 6951  df-sup 7281  df-pnf 8956  df-mnf 8957  df-xr 8958  df-ltxr 8959  df-le 8960  df-sub 9126  df-neg 9127  df-div 9511  df-nn 9834  df-2 9891  df-3 9892  df-n0 10055  df-z 10114  df-uz 10320  df-rp 10444  df-fl 11014  df-seq 11136  df-exp 11195  df-cj 11674  df-re 11675  df-im 11676  df-sqr 11810  df-abs 11811  df-clim 12052  df-rlim 12053
  Copyright terms: Public domain W3C validator