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Theorem ditgex 25821
Description: A directed integral is a set. (Contributed by Mario Carneiro, 7-Sep-2014.)
Assertion
Ref Expression
ditgex ⨜[𝐴𝐵]𝐶 d𝑥 ∈ V

Proof of Theorem ditgex
StepHypRef Expression
1 df-ditg 25816 . 2 ⨜[𝐴𝐵]𝐶 d𝑥 = if(𝐴𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥)
2 itgex 25739 . . 3 ∫(𝐴(,)𝐵)𝐶 d𝑥 ∈ V
3 negex 11390 . . 3 -∫(𝐵(,)𝐴)𝐶 d𝑥 ∈ V
42, 3ifex 4532 . 2 if(𝐴𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) ∈ V
51, 4eqeltri 2833 1 ⨜[𝐴𝐵]𝐶 d𝑥 ∈ V
Colors of variables: wff setvar class
Syntax hints:  wcel 2114  Vcvv 3442  ifcif 4481   class class class wbr 5100  (class class class)co 7368  cle 11179  -cneg 11377  (,)cioo 13273  citg 25587  cdit 25815
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-nul 5253
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-v 3444  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-uni 4866  df-iota 6456  df-fv 6508  df-ov 7371  df-neg 11379  df-sum 15622  df-itg 25592  df-ditg 25816
This theorem is referenced by:  itgsubstlem  26023
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