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Theorem ditgex 25842
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 25837 . 2 ⨜[𝐴𝐵]𝐶 d𝑥 = if(𝐴𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥)
2 itgex 25760 . . 3 ∫(𝐴(,)𝐵)𝐶 d𝑥 ∈ V
3 negex 11489 . . 3 -∫(𝐵(,)𝐴)𝐶 d𝑥 ∈ V
42, 3ifex 4558 . 2 if(𝐴𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) ∈ V
51, 4eqeltri 2829 1 ⨜[𝐴𝐵]𝐶 d𝑥 ∈ V
Colors of variables: wff setvar class
Syntax hints:  wcel 2107  Vcvv 3464  ifcif 4507   class class class wbr 5125  (class class class)co 7414  cle 11279  -cneg 11476  (,)cioo 13370  citg 25608  cdit 25836
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2706  ax-nul 5288
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2713  df-cleq 2726  df-clel 2808  df-ne 2932  df-v 3466  df-dif 3936  df-un 3938  df-ss 3950  df-nul 4316  df-if 4508  df-sn 4609  df-pr 4611  df-uni 4890  df-iota 6495  df-fv 6550  df-ov 7417  df-neg 11478  df-sum 15706  df-itg 25613  df-ditg 25837
This theorem is referenced by:  itgsubstlem  26044
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