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Theorem geoisumr 11459
Description: The infinite sum of reciprocals  1  +  ( 1  /  A ) ^ 1  +  ( 1  /  A ) ^ 2... is  A  / 
( A  -  1 ). (Contributed by rpenner, 3-Nov-2007.) (Revised by Mario Carneiro, 26-Apr-2014.)
Assertion
Ref Expression
geoisumr  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  sum_ k  e.  NN0  ( ( 1  /  A ) ^
k )  =  ( A  /  ( A  -  1 ) ) )
Distinct variable group:    A, k

Proof of Theorem geoisumr
Dummy variable  n is distinct from all other variables.
StepHypRef Expression
1 nn0uz 9500 . 2  |-  NN0  =  ( ZZ>= `  0 )
2 0zd 9203 . 2  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  0  e.  ZZ )
3 simpr 109 . . 3  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
k  e.  NN0 )
4 simpll 519 . . . . 5  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  ->  A  e.  CC )
54abscld 11123 . . . . . . 7  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( abs `  A
)  e.  RR )
6 0red 7900 . . . . . . . 8  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
0  e.  RR )
7 1red 7914 . . . . . . . 8  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
1  e.  RR )
8 0lt1 8025 . . . . . . . . 9  |-  0  <  1
98a1i 9 . . . . . . . 8  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
0  <  1 )
10 simplr 520 . . . . . . . 8  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
1  <  ( abs `  A ) )
116, 7, 5, 9, 10lttrd 8024 . . . . . . 7  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
0  <  ( abs `  A ) )
125, 11gt0ap0d 8527 . . . . . 6  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( abs `  A
) #  0 )
13 abs00ap 11004 . . . . . . 7  |-  ( A  e.  CC  ->  (
( abs `  A
) #  0  <->  A #  0
) )
1413ad2antrr 480 . . . . . 6  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( ( abs `  A
) #  0  <->  A #  0
) )
1512, 14mpbid 146 . . . . 5  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  ->  A #  0 )
164, 15recclapd 8677 . . . 4  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( 1  /  A
)  e.  CC )
1716, 3expcld 10588 . . 3  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( ( 1  /  A ) ^ k
)  e.  CC )
18 oveq2 5850 . . . 4  |-  ( n  =  k  ->  (
( 1  /  A
) ^ n )  =  ( ( 1  /  A ) ^
k ) )
19 eqid 2165 . . . 4  |-  ( n  e.  NN0  |->  ( ( 1  /  A ) ^ n ) )  =  ( n  e. 
NN0  |->  ( ( 1  /  A ) ^
n ) )
2018, 19fvmptg 5562 . . 3  |-  ( ( k  e.  NN0  /\  ( ( 1  /  A ) ^ k
)  e.  CC )  ->  ( ( n  e.  NN0  |->  ( ( 1  /  A ) ^ n ) ) `
 k )  =  ( ( 1  /  A ) ^ k
) )
213, 17, 20syl2anc 409 . 2  |-  ( ( ( A  e.  CC  /\  1  <  ( abs `  A ) )  /\  k  e.  NN0 )  -> 
( ( n  e. 
NN0  |->  ( ( 1  /  A ) ^
n ) ) `  k )  =  ( ( 1  /  A
) ^ k ) )
22 simpl 108 . . 3  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  A  e.  CC )
23 simpr 109 . . 3  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  1  <  ( abs `  A
) )
2422, 23, 21georeclim 11454 . 2  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  seq 0 (  +  , 
( n  e.  NN0  |->  ( ( 1  /  A ) ^ n
) ) )  ~~>  ( A  /  ( A  - 
1 ) ) )
251, 2, 21, 17, 24isumclim 11362 1  |-  ( ( A  e.  CC  /\  1  <  ( abs `  A
) )  ->  sum_ k  e.  NN0  ( ( 1  /  A ) ^
k )  =  ( A  /  ( A  -  1 ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1343    e. wcel 2136   class class class wbr 3982    |-> cmpt 4043   ` cfv 5188  (class class class)co 5842   CCcc 7751   0cc0 7753   1c1 7754    < clt 7933    - cmin 8069   # cap 8479    / cdiv 8568   NN0cn0 9114   ^cexp 10454   abscabs 10939   sum_csu 11294
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-mulrcl 7852  ax-addcom 7853  ax-mulcom 7854  ax-addass 7855  ax-mulass 7856  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-1rid 7860  ax-0id 7861  ax-rnegex 7862  ax-precex 7863  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-apti 7868  ax-pre-ltadd 7869  ax-pre-mulgt0 7870  ax-pre-mulext 7871  ax-arch 7872  ax-caucvg 7873
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rmo 2452  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-po 4274  df-iso 4275  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-isom 5197  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-irdg 6338  df-frec 6359  df-1o 6384  df-oadd 6388  df-er 6501  df-en 6707  df-dom 6708  df-fin 6709  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-reap 8473  df-ap 8480  df-div 8569  df-inn 8858  df-2 8916  df-3 8917  df-4 8918  df-n0 9115  df-z 9192  df-uz 9467  df-q 9558  df-rp 9590  df-fz 9945  df-fzo 10078  df-seqfrec 10381  df-exp 10455  df-ihash 10689  df-cj 10784  df-re 10785  df-im 10786  df-rsqrt 10940  df-abs 10941  df-clim 11220  df-sumdc 11295
This theorem is referenced by: (None)
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