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Theorem itgeq1f 19532
Description: Equality theorem for an integral. (Contributed by Mario Carneiro, 28-Jun-2014.)
Hypotheses
Ref Expression
itgeq1f.1  |-  F/_ x A
itgeq1f.2  |-  F/_ x B
Assertion
Ref Expression
itgeq1f  |-  ( A  =  B  ->  S. A C  _d x  =  S. B C  _d x )

Proof of Theorem itgeq1f
Dummy variable  k is distinct from all other variables.
StepHypRef Expression
1 eqid 2389 . . . . . 6  |-  RR  =  RR
2 itgeq1f.1 . . . . . . . 8  |-  F/_ x A
3 itgeq1f.2 . . . . . . . 8  |-  F/_ x B
42, 3nfeq 2532 . . . . . . 7  |-  F/ x  A  =  B
5 eleq2 2450 . . . . . . . . . 10  |-  ( A  =  B  ->  (
x  e.  A  <->  x  e.  B ) )
65anbi1d 686 . . . . . . . . 9  |-  ( A  =  B  ->  (
( x  e.  A  /\  0  <_  ( Re
`  ( C  / 
( _i ^ k
) ) ) )  <-> 
( x  e.  B  /\  0  <_  ( Re
`  ( C  / 
( _i ^ k
) ) ) ) ) )
76ifbid 3702 . . . . . . . 8  |-  ( A  =  B  ->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 )  =  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) )
87a1d 23 . . . . . . 7  |-  ( A  =  B  ->  (
x  e.  RR  ->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 )  =  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) )
94, 8ralrimi 2732 . . . . . 6  |-  ( A  =  B  ->  A. x  e.  RR  if ( ( x  e.  A  /\  0  <_  ( Re `  ( C  /  (
_i ^ k ) ) ) ) ,  ( Re `  ( C  /  ( _i ^
k ) ) ) ,  0 )  =  if ( ( x  e.  B  /\  0  <_  ( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) )
10 mpteq12 4231 . . . . . 6  |-  ( ( RR  =  RR  /\  A. x  e.  RR  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 )  =  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) )  -> 
( x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) )  =  ( x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) )
111, 9, 10sylancr 645 . . . . 5  |-  ( A  =  B  ->  (
x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) )  =  ( x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) )
1211fveq2d 5674 . . . 4  |-  ( A  =  B  ->  ( S.2 `  ( x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_  ( Re `  ( C  /  (
_i ^ k ) ) ) ) ,  ( Re `  ( C  /  ( _i ^
k ) ) ) ,  0 ) ) )  =  ( S.2 `  ( x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) )
1312oveq2d 6038 . . 3  |-  ( A  =  B  ->  (
( _i ^ k
)  x.  ( S.2 `  ( x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) )  =  ( ( _i ^ k )  x.  ( S.2 `  (
x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) ) )
1413sumeq2sdv 12427 . 2  |-  ( A  =  B  ->  sum_ k  e.  ( 0 ... 3
) ( ( _i
^ k )  x.  ( S.2 `  (
x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) )  =  sum_ k  e.  ( 0 ... 3
) ( ( _i
^ k )  x.  ( S.2 `  (
x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) ) )
15 eqid 2389 . . 3  |-  ( Re
`  ( C  / 
( _i ^ k
) ) )  =  ( Re `  ( C  /  ( _i ^
k ) ) )
1615dfitg 19530 . 2  |-  S. A C  _d x  =  sum_ k  e.  ( 0 ... 3 ) ( ( _i ^ k
)  x.  ( S.2 `  ( x  e.  RR  |->  if ( ( x  e.  A  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) )
1715dfitg 19530 . 2  |-  S. B C  _d x  =  sum_ k  e.  ( 0 ... 3 ) ( ( _i ^ k
)  x.  ( S.2 `  ( x  e.  RR  |->  if ( ( x  e.  B  /\  0  <_ 
( Re `  ( C  /  ( _i ^
k ) ) ) ) ,  ( Re
`  ( C  / 
( _i ^ k
) ) ) ,  0 ) ) ) )
1814, 16, 173eqtr4g 2446 1  |-  ( A  =  B  ->  S. A C  _d x  =  S. B C  _d x )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 359    = wceq 1649    e. wcel 1717   F/_wnfc 2512   A.wral 2651   ifcif 3684   class class class wbr 4155    e. cmpt 4209   ` cfv 5396  (class class class)co 6022   RRcr 8924   0cc0 8925   _ici 8927    x. cmul 8930    <_ cle 9056    / cdiv 9611   3c3 9984   ...cfz 10977   ^cexp 11311   Recre 11831   sum_csu 12408   S.2citg2 19377   S.citg 19379
This theorem is referenced by:  itgeq1  19533
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-13 1719  ax-14 1721  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2370  ax-sep 4273  ax-nul 4281  ax-pow 4320  ax-pr 4346  ax-un 4643  ax-cnex 8981  ax-resscn 8982  ax-1cn 8983  ax-icn 8984  ax-addcl 8985  ax-addrcl 8986  ax-mulcl 8987  ax-mulrcl 8988  ax-mulcom 8989  ax-addass 8990  ax-mulass 8991  ax-distr 8992  ax-i2m1 8993  ax-1ne0 8994  ax-1rid 8995  ax-rnegex 8996  ax-rrecex 8997  ax-cnre 8998  ax-pre-lttri 8999  ax-pre-lttrn 9000  ax-pre-ltadd 9001  ax-pre-mulgt0 9002
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2244  df-mo 2245  df-clab 2376  df-cleq 2382  df-clel 2385  df-nfc 2514  df-ne 2554  df-nel 2555  df-ral 2656  df-rex 2657  df-reu 2658  df-rab 2660  df-v 2903  df-sbc 3107  df-csb 3197  df-dif 3268  df-un 3270  df-in 3272  df-ss 3279  df-pss 3281  df-nul 3574  df-if 3685  df-pw 3746  df-sn 3765  df-pr 3766  df-tp 3767  df-op 3768  df-uni 3960  df-iun 4039  df-br 4156  df-opab 4210  df-mpt 4211  df-tr 4246  df-eprel 4437  df-id 4441  df-po 4446  df-so 4447  df-fr 4484  df-we 4486  df-ord 4527  df-on 4528  df-lim 4529  df-suc 4530  df-om 4788  df-xp 4826  df-rel 4827  df-cnv 4828  df-co 4829  df-dm 4830  df-rn 4831  df-res 4832  df-ima 4833  df-iota 5360  df-fun 5398  df-fn 5399  df-f 5400  df-f1 5401  df-fo 5402  df-f1o 5403  df-fv 5404  df-ov 6025  df-oprab 6026  df-mpt2 6027  df-1st 6290  df-2nd 6291  df-riota 6487  df-recs 6571  df-rdg 6606  df-er 6843  df-en 7048  df-dom 7049  df-sdom 7050  df-pnf 9057  df-mnf 9058  df-xr 9059  df-ltxr 9060  df-le 9061  df-sub 9227  df-neg 9228  df-nn 9935  df-n0 10156  df-z 10217  df-uz 10423  df-fz 10978  df-seq 11253  df-sum 12409  df-itg 19385
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