Theorem explecnv 11849

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.

Step	Hyp	Ref	Expression
1		eqid 2205	. . 3 |- ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) = ( ZZ>= ` if ( M <_ 0 , 0 , M ) )
2		0z 9385	. . . 4 |- 0 e. ZZ
3		explecnv.3	. . . 4 |- ( ph -> M e. ZZ )
4		0zd 9386	. . . . 5 |- ( ( 0 e. ZZ /\ M e. ZZ ) -> 0 e. ZZ )
5		simpr 110	. . . . 5 |- ( ( 0 e. ZZ /\ M e. ZZ ) -> M e. ZZ )
6		zdcle 9451	. . . . . 6 |- ( ( M e. ZZ /\ 0 e. ZZ ) -> DECID M <_ 0 )
7	6	ancoms 268	. . . . 5 |- ( ( 0 e. ZZ /\ M e. ZZ ) -> DECID M <_ 0 )
8	4, 5, 7	ifcldcd 3608	. . . 4 |- ( ( 0 e. ZZ /\ M e. ZZ ) -> if ( M <_ 0 , 0 , M ) e. ZZ )
9	2, 3, 8	sylancr 414	. . 3 |- ( ph -> if ( M <_ 0 , 0 , M ) e. ZZ )
10		explecnv.5	. . . . 5 |- ( ph -> A e. RR )
11	10	recnd 8103	. . . 4 |- ( ph -> A e. CC )
12		explecnv.4	. . . 4 |- ( ph -> ( abs ` A ) < 1 )
13	11, 12	expcnv 11848	. . 3 |- ( ph -> ( n e. NN0 |-> ( A ^ n ) ) ~~> 0 )
14		zex 9383	. . . . . 6 |- ZZ e. _V
15		explecnv.1	. . . . . . 7 |- Z = ( ZZ>= ` M )
16		uzssz 9670	. . . . . . 7 |- ( ZZ>= ` M ) C_ ZZ
17	15, 16	eqsstri 3225	. . . . . 6 |- Z C_ ZZ
18	14, 17	ssexi 4183	. . . . 5 |- Z e. _V
19	18	mptex 5812	. . . 4 |- ( n e. Z |-> ( abs ` ( F ` n ) ) ) e. _V
20	19	a1i 9	. . 3 |- ( ph -> ( n e. Z |-> ( abs ` ( F ` n ) ) ) e. _V )
21		nn0uz 9685	. . . . . . . . . 10 |- NN0 = ( ZZ>= ` 0 )
22	15, 21	ineq12i 3372	. . . . . . . . 9 |- ( Z i^i NN0 ) = ( ( ZZ>= ` M ) i^i ( ZZ>= ` 0 ) )
23		uzin 9683	. . . . . . . . . 10 |- ( ( M e. ZZ /\ 0 e. ZZ ) -> ( ( ZZ>= ` M ) i^i ( ZZ>= ` 0 ) ) = ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) )
24	3, 2, 23	sylancl 413	. . . . . . . . 9 |- ( ph -> ( ( ZZ>= ` M ) i^i ( ZZ>= ` 0 ) ) = ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) )
25	22, 24	eqtr2id 2251	. . . . . . . 8 |- ( ph -> ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) = ( Z i^i NN0 ) )
26	25	eleq2d 2275	. . . . . . 7 |- ( ph -> ( k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) <-> k e. ( Z i^i NN0 ) ) )
27	26	biimpa 296	. . . . . 6 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> k e. ( Z i^i NN0 ) )
28	27	elin2d 3363	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> k e. NN0 )
29	11	adantr 276	. . . . . 6 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> A e. CC )
30	29, 28	expcld 10820	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( A ^ k ) e. CC )
31		oveq2 5954	. . . . . 6 |- ( n = k -> ( A ^ n ) = ( A ^ k ) )
32		eqid 2205	. . . . . 6 |- ( n e. NN0 |-> ( A ^ n ) ) = ( n e. NN0 |-> ( A ^ n ) )
33	31, 32	fvmptg 5657	. . . . 5 |- ( ( k e. NN0 /\ ( A ^ k ) e. CC ) -> ( ( n e. NN0 |-> ( A ^ n ) ) ` k ) = ( A ^ k ) )
34	28, 30, 33	syl2anc 411	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. NN0 |-> ( A ^ n ) ) ` k ) = ( A ^ k ) )
35	10	adantr 276	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> A e. RR )
36	35, 28	reexpcld 10837	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( A ^ k ) e. RR )
37	34, 36	eqeltrd 2282	. . 3 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. NN0 |-> ( A ^ n ) ) ` k ) e. RR )
38	27	elin1d 3362	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> k e. Z )
39		explecnv.6	. . . . . . 7 |- ( ( ph /\ k e. Z ) -> ( F ` k ) e. CC )
40	38, 39	syldan 282	. . . . . 6 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( F ` k ) e. CC )
41	40	abscld 11525	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( abs ` ( F ` k ) ) e. RR )
42		2fveq3 5583	. . . . . 6 |- ( n = k -> ( abs ` ( F ` n ) ) = ( abs ` ( F ` k ) ) )
43		eqid 2205	. . . . . 6 |- ( n e. Z |-> ( abs ` ( F ` n ) ) ) = ( n e. Z |-> ( abs ` ( F ` n ) ) )
44	42, 43	fvmptg 5657	. . . . 5 |- ( ( k e. Z /\ ( abs ` ( F ` k ) ) e. RR ) -> ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) = ( abs ` ( F ` k ) ) )
45	38, 41, 44	syl2anc 411	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) = ( abs ` ( F ` k ) ) )
46	45, 41	eqeltrd 2282	. . 3 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) e. RR )
47		explecnv.7	. . . . 5 |- ( ( ph /\ k e. Z ) -> ( abs ` ( F ` k ) ) <_ ( A ^ k ) )
48	38, 47	syldan 282	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( abs ` ( F ` k ) ) <_ ( A ^ k ) )
49	48, 45, 34	3brtr4d 4077	. . 3 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) <_ ( ( n e. NN0 |-> ( A ^ n ) ) ` k ) )
50	40	absge0d 11528	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> 0 <_ ( abs ` ( F ` k ) ) )
51	50, 45	breqtrrd 4073	. . 3 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> 0 <_ ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) )
52	1, 9, 13, 20, 37, 46, 49, 51	climsqz2 11680	. 2 |- ( ph -> ( n e. Z |-> ( abs ` ( F ` n ) ) ) ~~> 0 )
53		explecnv.2	. . 3 |- ( ph -> F e. V )
54		simpr 110	. . . 4 |- ( ( ph /\ k e. Z ) -> k e. Z )
55	39	abscld 11525	. . . 4 |- ( ( ph /\ k e. Z ) -> ( abs ` ( F ` k ) ) e. RR )
56	54, 55, 44	syl2anc 411	. . 3 |- ( ( ph /\ k e. Z ) -> ( ( n e. Z |-> ( abs ` ( F ` n ) ) ) ` k ) = ( abs ` ( F ` k ) ) )
57	15, 3, 53, 20, 39, 56	climabs0 11651	. 2 |- ( ph -> ( F ~~> 0 <-> ( n e. Z |-> ( abs ` ( F ` n ) ) ) ~~> 0 ) )
58	52, 57	mpbird 167	1 |- ( ph -> F ~~> 0 )

Syntax hints:   -> wi 4   /\ wa 104  DECID wdc 836   = wceq 1373   e. wcel 2176   _Vcvv 2772   i^i cin 3165   ifcif 3571   class class class wbr 4045   |-> cmpt 4106   ` cfv 5272  (class class class)co 5946   CCcc 7925   RRcr 7926   0cc0 7927   1c1 7928   < clt 8109   <_ cle 8110   NN0cn0 9297   ZZcz 9374   ZZ>=cuz 9650   ^cexp 10685   abscabs 11341   ~~> cli 11622

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 615  ax-in2 616  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-coll 4160  ax-sep 4163  ax-nul 4171  ax-pow 4219  ax-pr 4254  ax-un 4481  ax-setind 4586  ax-iinf 4637  ax-cnex 8018  ax-resscn 8019  ax-1cn 8020  ax-1re 8021  ax-icn 8022  ax-addcl 8023  ax-addrcl 8024  ax-mulcl 8025  ax-mulrcl 8026  ax-addcom 8027  ax-mulcom 8028  ax-addass 8029  ax-mulass 8030  ax-distr 8031  ax-i2m1 8032  ax-0lt1 8033  ax-1rid 8034  ax-0id 8035  ax-rnegex 8036  ax-precex 8037  ax-cnre 8038  ax-pre-ltirr 8039  ax-pre-ltwlin 8040  ax-pre-lttrn 8041  ax-pre-apti 8042  ax-pre-ltadd 8043  ax-pre-mulgt0 8044  ax-pre-mulext 8045  ax-arch 8046  ax-caucvg 8047

This theorem depends on definitions:  df-bi 117  df-dc 837  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ne 2377  df-nel 2472  df-ral 2489  df-rex 2490  df-reu 2491  df-rmo 2492  df-rab 2493  df-v 2774  df-sbc 2999  df-csb 3094  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3461  df-if 3572  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-int 3886  df-iun 3929  df-br 4046  df-opab 4107  df-mpt 4108  df-tr 4144  df-id 4341  df-po 4344  df-iso 4345  df-iord 4414  df-on 4416  df-ilim 4417  df-suc 4419  df-iom 4640  df-xp 4682  df-rel 4683  df-cnv 4684  df-co 4685  df-dm 4686  df-rn 4687  df-res 4688  df-ima 4689  df-iota 5233  df-fun 5274  df-fn 5275  df-f 5276  df-f1 5277  df-fo 5278  df-f1o 5279  df-fv 5280  df-riota 5901  df-ov 5949  df-oprab 5950  df-mpo 5951  df-1st 6228  df-2nd 6229  df-recs 6393  df-frec 6479  df-pnf 8111  df-mnf 8112  df-xr 8113  df-ltxr 8114  df-le 8115  df-sub 8247  df-neg 8248  df-reap 8650  df-ap 8657  df-div 8748  df-inn 9039  df-2 9097  df-3 9098  df-4 9099  df-n0 9298  df-z 9375  df-uz 9651  df-q 9743  df-rp 9778  df-seqfrec 10595  df-exp 10686  df-cj 11186  df-re 11187  df-im 11188  df-rsqrt 11342  df-abs 11343  df-clim 11623

This theorem is referenced by: (None)