Theorem explecnv 12195

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 2234	. . 3 |- ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) = ( ZZ>= ` if ( M <_ 0 , 0 , M ) )
2		0z 9590	. . . 4 |- 0 e. ZZ
3		explecnv.3	. . . 4 |- ( ph -> M e. ZZ )
4		0zd 9591	. . . . 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 9656	. . . . . 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 3662	. . . 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 8304	. . . 4 |- ( ph -> A e. CC )
12		explecnv.4	. . . 4 |- ( ph -> ( abs ` A ) < 1 )
13	11, 12	expcnv 12194	. . 3 |- ( ph -> ( n e. NN0 |-> ( A ^ n ) ) ~~> 0 )
14		zex 9588	. . . . . 6 |- ZZ e. _V
15		explecnv.1	. . . . . . 7 |- Z = ( ZZ>= ` M )
16		uzssz 9877	. . . . . . 7 |- ( ZZ>= ` M ) C_ ZZ
17	15, 16	eqsstri 3272	. . . . . 6 |- Z C_ ZZ
18	14, 17	ssexi 4250	. . . . 5 |- Z e. _V
19	18	mptex 5914	. . . 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 9892	. . . . . . . . . 10 |- NN0 = ( ZZ>= ` 0 )
22	15, 21	ineq12i 3422	. . . . . . . . 9 |- ( Z i^i NN0 ) = ( ( ZZ>= ` M ) i^i ( ZZ>= ` 0 ) )
23		uzin 9890	. . . . . . . . . 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 2280	. . . . . . . 8 |- ( ph -> ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) = ( Z i^i NN0 ) )
26	25	eleq2d 2304	. . . . . . 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 3411	. . . . 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 11039	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( A ^ k ) e. CC )
31		oveq2 6060	. . . . . 6 |- ( n = k -> ( A ^ n ) = ( A ^ k ) )
32		eqid 2234	. . . . . 6 |- ( n e. NN0 |-> ( A ^ n ) ) = ( n e. NN0 |-> ( A ^ n ) )
33	31, 32	fvmptg 5755	. . . . 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 11056	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( A ^ k ) e. RR )
37	34, 36	eqeltrd 2311	. . 3 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( ( n e. NN0 |-> ( A ^ n ) ) ` k ) e. RR )
38	27	elin1d 3410	. . . . 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 11870	. . . . 5 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> ( abs ` ( F ` k ) ) e. RR )
42		2fveq3 5677	. . . . . 6 |- ( n = k -> ( abs ` ( F ` n ) ) = ( abs ` ( F ` k ) ) )
43		eqid 2234	. . . . . 6 |- ( n e. Z |-> ( abs ` ( F ` n ) ) ) = ( n e. Z |-> ( abs ` ( F ` n ) ) )
44	42, 43	fvmptg 5755	. . . . 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 2311	. . 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 4143	. . 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 11873	. . . 4 |- ( ( ph /\ k e. ( ZZ>= ` if ( M <_ 0 , 0 , M ) ) ) -> 0 <_ ( abs ` ( F ` k ) ) )
51	50, 45	breqtrrd 4139	. . 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 12025	. 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 11870	. . . 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 11996	. 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 842   = wceq 1398   e. wcel 2205   _Vcvv 2815   i^i cin 3212   ifcif 3622   class class class wbr 4111   |-> cmpt 4173   ` cfv 5354  (class class class)co 6052   CCcc 8127   RRcr 8128   0cc0 8129   1c1 8130   < clt 8310   <_ cle 8311   NN0cn0 9498   ZZcz 9579   ZZ>=cuz 9856   ^cexp 10904   abscabs 11686   ~~> cli 11967

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-mulrcl 8228  ax-addcom 8229  ax-mulcom 8230  ax-addass 8231  ax-mulass 8232  ax-distr 8233  ax-i2m1 8234  ax-0lt1 8235  ax-1rid 8236  ax-0id 8237  ax-rnegex 8238  ax-precex 8239  ax-cnre 8240  ax-pre-ltirr 8241  ax-pre-ltwlin 8242  ax-pre-lttrn 8243  ax-pre-apti 8244  ax-pre-ltadd 8245  ax-pre-mulgt0 8246  ax-pre-mulext 8247  ax-arch 8248  ax-caucvg 8249

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-if 3623  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-po 4419  df-iso 4420  df-iord 4489  df-on 4491  df-ilim 4492  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-frec 6624  df-pnf 8312  df-mnf 8313  df-xr 8314  df-ltxr 8315  df-le 8316  df-sub 8448  df-neg 8449  df-reap 8851  df-ap 8858  df-div 8949  df-inn 9240  df-2 9298  df-3 9299  df-4 9300  df-n0 9499  df-z 9580  df-uz 9857  df-q 9955  df-rp 9990  df-seqfrec 10814  df-exp 10905  df-cj 11531  df-re 11532  df-im 11533  df-rsqrt 11687  df-abs 11688  df-clim 11968

This theorem is referenced by: (None)