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Theorem fsumrev2 12557
Description: Reversal of a finite sum. (Contributed by NM, 27-Nov-2005.) (Revised by Mario Carneiro, 13-Apr-2016.)
Hypotheses
Ref Expression
fsumrev2.1  |-  ( (
ph  /\  j  e.  ( M ... N ) )  ->  A  e.  CC )
fsumrev2.2  |-  ( j  =  ( ( M  +  N )  -  k )  ->  A  =  B )
Assertion
Ref Expression
fsumrev2  |-  ( ph  -> 
sum_ j  e.  ( M ... N ) A  =  sum_ k  e.  ( M ... N
) B )
Distinct variable groups:    A, k    B, j    j, k, M   
j, N, k    ph, j,
k
Allowed substitution hints:    A( j)    B( k)

Proof of Theorem fsumrev2
StepHypRef Expression
1 sum0 12507 . . . . 5  |-  sum_ j  e.  (/)  A  =  0
2 sum0 12507 . . . . 5  |-  sum_ k  e.  (/)  B  =  0
31, 2eqtr4i 2458 . . . 4  |-  sum_ j  e.  (/)  A  =  sum_ k  e.  (/)  B
4 sumeq1 12475 . . . 4  |-  ( ( M ... N )  =  (/)  ->  sum_ j  e.  ( M ... N
) A  =  sum_ j  e.  (/)  A )
5 sumeq1 12475 . . . 4  |-  ( ( M ... N )  =  (/)  ->  sum_ k  e.  ( M ... N
) B  =  sum_ k  e.  (/)  B )
63, 4, 53eqtr4a 2493 . . 3  |-  ( ( M ... N )  =  (/)  ->  sum_ j  e.  ( M ... N
) A  =  sum_ k  e.  ( M ... N ) B )
76adantl 453 . 2  |-  ( (
ph  /\  ( M ... N )  =  (/) )  ->  sum_ j  e.  ( M ... N ) A  =  sum_ k  e.  ( M ... N
) B )
8 fzn0 11062 . . 3  |-  ( ( M ... N )  =/=  (/)  <->  N  e.  ( ZZ>=
`  M ) )
9 eluzel2 10485 . . . . . . 7  |-  ( N  e.  ( ZZ>= `  M
)  ->  M  e.  ZZ )
109adantl 453 . . . . . 6  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  M  e.  ZZ )
11 eluzelz 10488 . . . . . . 7  |-  ( N  e.  ( ZZ>= `  M
)  ->  N  e.  ZZ )
1211adantl 453 . . . . . 6  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  N  e.  ZZ )
1310, 12zaddcld 10371 . . . . 5  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  ( M  +  N )  e.  ZZ )
14 fsumrev2.1 . . . . . 6  |-  ( (
ph  /\  j  e.  ( M ... N ) )  ->  A  e.  CC )
1514adantlr 696 . . . . 5  |-  ( ( ( ph  /\  N  e.  ( ZZ>= `  M )
)  /\  j  e.  ( M ... N ) )  ->  A  e.  CC )
16 fsumrev2.2 . . . . 5  |-  ( j  =  ( ( M  +  N )  -  k )  ->  A  =  B )
1713, 10, 12, 15, 16fsumrev 12554 . . . 4  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  sum_ j  e.  ( M ... N
) A  =  sum_ k  e.  ( (
( M  +  N
)  -  N ) ... ( ( M  +  N )  -  M ) ) B )
1810zcnd 10368 . . . . . . 7  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  M  e.  CC )
1912zcnd 10368 . . . . . . 7  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  N  e.  CC )
2018, 19pncand 9404 . . . . . 6  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  ( ( M  +  N )  -  N )  =  M )
2118, 19pncan2d 9405 . . . . . 6  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  ( ( M  +  N )  -  M )  =  N )
2220, 21oveq12d 6091 . . . . 5  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  ( (
( M  +  N
)  -  N ) ... ( ( M  +  N )  -  M ) )  =  ( M ... N
) )
2322sumeq1d 12487 . . . 4  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  sum_ k  e.  ( ( ( M  +  N )  -  N ) ... (
( M  +  N
)  -  M ) ) B  =  sum_ k  e.  ( M ... N ) B )
2417, 23eqtrd 2467 . . 3  |-  ( (
ph  /\  N  e.  ( ZZ>= `  M )
)  ->  sum_ j  e.  ( M ... N
) A  =  sum_ k  e.  ( M ... N ) B )
258, 24sylan2b 462 . 2  |-  ( (
ph  /\  ( M ... N )  =/=  (/) )  ->  sum_ j  e.  ( M ... N ) A  =  sum_ k  e.  ( M ... N ) B )
267, 25pm2.61dane 2676 1  |-  ( ph  -> 
sum_ j  e.  ( M ... N ) A  =  sum_ k  e.  ( M ... N
) B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 359    = wceq 1652    e. wcel 1725    =/= wne 2598   (/)c0 3620   ` cfv 5446  (class class class)co 6073   CCcc 8980   0cc0 8982    + caddc 8985    - cmin 9283   ZZcz 10274   ZZ>=cuz 10480   ...cfz 11035   sum_csu 12471
This theorem is referenced by:  fsum0diag2  12558  efaddlem  12687  aareccl  20235
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-rep 4312  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4693  ax-inf2 7588  ax-cnex 9038  ax-resscn 9039  ax-1cn 9040  ax-icn 9041  ax-addcl 9042  ax-addrcl 9043  ax-mulcl 9044  ax-mulrcl 9045  ax-mulcom 9046  ax-addass 9047  ax-mulass 9048  ax-distr 9049  ax-i2m1 9050  ax-1ne0 9051  ax-1rid 9052  ax-rnegex 9053  ax-rrecex 9054  ax-cnre 9055  ax-pre-lttri 9056  ax-pre-lttrn 9057  ax-pre-ltadd 9058  ax-pre-mulgt0 9059  ax-pre-sup 9060
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-nel 2601  df-ral 2702  df-rex 2703  df-reu 2704  df-rmo 2705  df-rab 2706  df-v 2950  df-sbc 3154  df-csb 3244  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-int 4043  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-tr 4295  df-eprel 4486  df-id 4490  df-po 4495  df-so 4496  df-fr 4533  df-se 4534  df-we 4535  df-ord 4576  df-on 4577  df-lim 4578  df-suc 4579  df-om 4838  df-xp 4876  df-rel 4877  df-cnv 4878  df-co 4879  df-dm 4880  df-rn 4881  df-res 4882  df-ima 4883  df-iota 5410  df-fun 5448  df-fn 5449  df-f 5450  df-f1 5451  df-fo 5452  df-f1o 5453  df-fv 5454  df-isom 5455  df-ov 6076  df-oprab 6077  df-mpt2 6078  df-1st 6341  df-2nd 6342  df-riota 6541  df-recs 6625  df-rdg 6660  df-1o 6716  df-oadd 6720  df-er 6897  df-en 7102  df-dom 7103  df-sdom 7104  df-fin 7105  df-sup 7438  df-oi 7471  df-card 7818  df-pnf 9114  df-mnf 9115  df-xr 9116  df-ltxr 9117  df-le 9118  df-sub 9285  df-neg 9286  df-div 9670  df-nn 9993  df-2 10050  df-3 10051  df-n0 10214  df-z 10275  df-uz 10481  df-rp 10605  df-fz 11036  df-fzo 11128  df-seq 11316  df-exp 11375  df-hash 11611  df-cj 11896  df-re 11897  df-im 11898  df-sqr 12032  df-abs 12033  df-clim 12274  df-sum 12472
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