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Theorem ditgex 26177
Description: A directed integral is a set. (Contributed by Mario Carneiro, 7-Sep-2014.)
Assertion
Ref Expression
ditgex ⨜[𝐴 → 𝐵]𝐶 d𝑥 ∈ V

Proof of Theorem ditgex
StepHypRef Expression
1 df-ditg 26172 . 2 ⨜[𝐴 → 𝐵]𝐶 d𝑥 = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥)
2 itgex 26096 . . 3 ∫(𝐴(,)𝐵)𝐶 d𝑥 ∈ V
3 negex 11558 . . 3 -∫(𝐵(,)𝐴)𝐶 d𝑥 ∈ V
42, 3ifex 4532 . 2 if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) ∈ V
51, 4eqeltri 2856 1 ⨜[𝐴 → 𝐵]𝐶 d𝑥 ∈ V
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∈ wcel 2144  Vcvv 3450  ifcif 4481   class class class wbr 5102  (class class class)co 7420   ≤ cle 11347   -cneg 11545  (,)cioo 13479  ∫citg 25944  ⨜cdit 26171
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-nul 5259
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-v 3452  df-ss 3896  df-dif 4047  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-uni 4867  df-iota 6494  df-fv 6546  df-ov 7423  df-neg 11547  df-sum 15859  df-itg 25949  df-ditg 26172
This theorem is used by:  itgsubstlem  26373
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