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Theorem itgeq1f 19655
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 2435 . . . . . 6  |-  RR  =  RR
2 itgeq1f.1 . . . . . . . 8  |-  F/_ x A
3 itgeq1f.2 . . . . . . . 8  |-  F/_ x B
42, 3nfeq 2578 . . . . . . 7  |-  F/ x  A  =  B
5 eleq2 2496 . . . . . . . . . 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 3749 . . . . . . . 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 2779 . . . . . 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 4280 . . . . . 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 5724 . . . 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 6089 . . 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 12490 . 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 2435 . . 3  |-  ( Re
`  ( C  / 
( _i ^ k
) ) )  =  ( Re `  ( C  /  ( _i ^
k ) ) )
1615dfitg 19653 . 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 19653 . 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 2492 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 1652    e. wcel 1725   F/_wnfc 2558   A.wral 2697   ifcif 3731   class class class wbr 4204    e. cmpt 4258   ` cfv 5446  (class class class)co 6073   RRcr 8981   0cc0 8982   _ici 8984    x. cmul 8987    <_ cle 9113    / cdiv 9669   3c3 10042   ...cfz 11035   ^cexp 11374   Recre 11894   sum_csu 12471   S.2citg2 19500   S.citg 19502
This theorem is referenced by:  itgeq1  19656
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-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4693  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
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-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-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-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-ov 6076  df-oprab 6077  df-mpt2 6078  df-1st 6341  df-2nd 6342  df-riota 6541  df-recs 6625  df-rdg 6660  df-er 6897  df-en 7102  df-dom 7103  df-sdom 7104  df-pnf 9114  df-mnf 9115  df-xr 9116  df-ltxr 9117  df-le 9118  df-sub 9285  df-neg 9286  df-nn 9993  df-n0 10214  df-z 10275  df-uz 10481  df-fz 11036  df-seq 11316  df-sum 12472  df-itg 19508
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