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Theorem ditgex 23616
Description: A directed integral is a set. (Contributed by Mario Carneiro, 7-Sep-2014.)
Assertion
Ref Expression
ditgex  |-  S__ [ A  ->  B ] C  _d x  e.  _V

Proof of Theorem ditgex
StepHypRef Expression
1 df-ditg 23611 . 2  |-  S__ [ A  ->  B ] C  _d x  =  if ( A  <_  B ,  S. ( A (,) B
) C  _d x ,  -u S. ( B (,) A ) C  _d x )
2 itgex 23537 . . 3  |-  S. ( A (,) B ) C  _d x  e. 
_V
3 negex 10279 . . 3  |-  -u S. ( B (,) A ) C  _d x  e. 
_V
42, 3ifex 4156 . 2  |-  if ( A  <_  B ,  S. ( A (,) B
) C  _d x ,  -u S. ( B (,) A ) C  _d x )  e. 
_V
51, 4eqeltri 2697 1  |-  S__ [ A  ->  B ] C  _d x  e.  _V
Colors of variables: wff setvar class
Syntax hints:    e. wcel 1990   _Vcvv 3200   ifcif 4086   class class class wbr 4653  (class class class)co 6650    <_ cle 10075   -ucneg 10267   (,)cioo 12175   S.citg 23387   S__cdit 23610
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-nul 4789
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-uni 4437  df-iota 5851  df-fv 5896  df-ov 6653  df-neg 10269  df-sum 14417  df-itg 23392  df-ditg 23611
This theorem is referenced by:  itgsubstlem  23811
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