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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 25804 | . 2 ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) | |
| 2 | itgex 25727 | . . 3 ⊢ ∫(𝐴(,)𝐵)𝐶 d𝑥 ∈ V | |
| 3 | negex 11378 | . . 3 ⊢ -∫(𝐵(,)𝐴)𝐶 d𝑥 ∈ V | |
| 4 | 2, 3 | ifex 4530 | . 2 ⊢ if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) ∈ V |
| 5 | 1, 4 | eqeltri 2832 | 1 ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 Vcvv 3440 ifcif 4479 class class class wbr 5098 (class class class)co 7358 ≤ cle 11167 -cneg 11365 (,)cioo 13261 ∫citg 25575 ⨜cdit 25803 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-nul 5251 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-uni 4864 df-iota 6448 df-fv 6500 df-ov 7361 df-neg 11367 df-sum 15610 df-itg 25580 df-ditg 25804 |
| This theorem is referenced by: itgsubstlem 26011 |
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