Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-mbfm | Structured version Visualization version GIF version |
Description: Define the measurable
function builder, which generates the set of
measurable functions from a measurable space to another one. Here, the
measurable spaces are given using their sigma-algebras 𝑠 and
𝑡,
and the spaces themselves are recovered by ∪ 𝑠 and ∪ 𝑡.
Note the similarities between the definition of measurable functions in measure theory, and of continuous functions in topology. This is the definition for the generic measure theory. For the specific case of functions from ℝ to ℂ, see df-mbf 24828. (Contributed by Thierry Arnoux, 23-Jan-2017.) |
Ref | Expression |
---|---|
df-mbfm | ⊢ MblFnM = (𝑠 ∈ ∪ ran sigAlgebra, 𝑡 ∈ ∪ ran sigAlgebra ↦ {𝑓 ∈ (∪ 𝑡 ↑m ∪ 𝑠) ∣ ∀𝑥 ∈ 𝑡 (◡𝑓 “ 𝑥) ∈ 𝑠}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cmbfm 32262 | . 2 class MblFnM | |
2 | vs | . . 3 setvar 𝑠 | |
3 | vt | . . 3 setvar 𝑡 | |
4 | csiga 32121 | . . . . 5 class sigAlgebra | |
5 | 4 | crn 5601 | . . . 4 class ran sigAlgebra |
6 | 5 | cuni 4844 | . . 3 class ∪ ran sigAlgebra |
7 | vf | . . . . . . . . 9 setvar 𝑓 | |
8 | 7 | cv 1538 | . . . . . . . 8 class 𝑓 |
9 | 8 | ccnv 5599 | . . . . . . 7 class ◡𝑓 |
10 | vx | . . . . . . . 8 setvar 𝑥 | |
11 | 10 | cv 1538 | . . . . . . 7 class 𝑥 |
12 | 9, 11 | cima 5603 | . . . . . 6 class (◡𝑓 “ 𝑥) |
13 | 2 | cv 1538 | . . . . . 6 class 𝑠 |
14 | 12, 13 | wcel 2104 | . . . . 5 wff (◡𝑓 “ 𝑥) ∈ 𝑠 |
15 | 3 | cv 1538 | . . . . 5 class 𝑡 |
16 | 14, 10, 15 | wral 3062 | . . . 4 wff ∀𝑥 ∈ 𝑡 (◡𝑓 “ 𝑥) ∈ 𝑠 |
17 | 15 | cuni 4844 | . . . . 5 class ∪ 𝑡 |
18 | 13 | cuni 4844 | . . . . 5 class ∪ 𝑠 |
19 | cmap 8646 | . . . . 5 class ↑m | |
20 | 17, 18, 19 | co 7307 | . . . 4 class (∪ 𝑡 ↑m ∪ 𝑠) |
21 | 16, 7, 20 | crab 3284 | . . 3 class {𝑓 ∈ (∪ 𝑡 ↑m ∪ 𝑠) ∣ ∀𝑥 ∈ 𝑡 (◡𝑓 “ 𝑥) ∈ 𝑠} |
22 | 2, 3, 6, 6, 21 | cmpo 7309 | . 2 class (𝑠 ∈ ∪ ran sigAlgebra, 𝑡 ∈ ∪ ran sigAlgebra ↦ {𝑓 ∈ (∪ 𝑡 ↑m ∪ 𝑠) ∣ ∀𝑥 ∈ 𝑡 (◡𝑓 “ 𝑥) ∈ 𝑠}) |
23 | 1, 22 | wceq 1539 | 1 wff MblFnM = (𝑠 ∈ ∪ ran sigAlgebra, 𝑡 ∈ ∪ ran sigAlgebra ↦ {𝑓 ∈ (∪ 𝑡 ↑m ∪ 𝑠) ∣ ∀𝑥 ∈ 𝑡 (◡𝑓 “ 𝑥) ∈ 𝑠}) |
Colors of variables: wff setvar class |
This definition is referenced by: ismbfm 32264 elunirnmbfm 32265 |
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