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| Mirrors > Home > MPE Home > Th. List > ditgex | Structured version Visualization version GIF version | ||
| Description: A directed integral is a set. (Contributed by Mario Carneiro, 7-Sep-2014.) |
| Ref | Expression |
|---|---|
| ditgex | ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ditg 25824 | . 2 ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) | |
| 2 | itgex 25747 | . . 3 ⊢ ∫(𝐴(,)𝐵)𝐶 d𝑥 ∈ V | |
| 3 | negex 11382 | . . 3 ⊢ -∫(𝐵(,)𝐴)𝐶 d𝑥 ∈ V | |
| 4 | 2, 3 | ifex 4518 | . 2 ⊢ if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) ∈ V |
| 5 | 1, 4 | eqeltri 2833 | 1 ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3430 ifcif 4467 class class class wbr 5086 (class class class)co 7360 ≤ cle 11171 -cneg 11369 (,)cioo 13289 ∫citg 25595 ⨜cdit 25823 |
| 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 5241 |
| 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 3432 df-dif 3893 df-un 3895 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-uni 4852 df-iota 6448 df-fv 6500 df-ov 7363 df-neg 11371 df-sum 15640 df-itg 25600 df-ditg 25824 |
| This theorem is referenced by: itgsubstlem 26025 |
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