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large-locale-of-subtypes.lagda.md
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large-locale-of-subtypes.lagda.md
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# The large locale of subtypes
```agda
module foundation.large-locale-of-subtypes where
```
<details><summary>Imports</summary>
```agda
open import foundation.large-binary-relations
open import foundation.large-locale-of-propositions
open import foundation.universe-levels
open import foundation-core.identity-types
open import foundation-core.sets
open import order-theory.greatest-lower-bounds-large-posets
open import order-theory.large-locales
open import order-theory.large-meet-semilattices
open import order-theory.large-posets
open import order-theory.large-suplattices
open import order-theory.least-upper-bounds-large-posets
open import order-theory.powers-of-large-locales
```
</details>
## Idea
The **large locale of subtypes** of a type `A` is the
[power locale](order-theory.powers-of-large-locales.md) `A → Prop-Large-Locale`.
## Definition
```agda
module _
{l1 : Level} (A : UU l1)
where
powerset-Large-Locale :
Large-Locale (λ l2 → l1 ⊔ lsuc l2) (λ l2 l3 → l1 ⊔ (l2 ⊔ l3)) lzero
powerset-Large-Locale = power-Large-Locale A Prop-Large-Locale
large-poset-powerset-Large-Locale :
Large-Poset (λ l2 → l1 ⊔ lsuc l2) (λ l2 l3 → l1 ⊔ (l2 ⊔ l3))
large-poset-powerset-Large-Locale =
large-poset-Large-Locale powerset-Large-Locale
set-powerset-Large-Locale : (l : Level) → Set (l1 ⊔ lsuc l)
set-powerset-Large-Locale =
set-Large-Locale powerset-Large-Locale
type-powerset-Large-Locale : (l : Level) → UU (l1 ⊔ lsuc l)
type-powerset-Large-Locale =
type-Large-Locale powerset-Large-Locale
is-set-type-powerset-Large-Locale :
{l : Level} → is-set (type-powerset-Large-Locale l)
is-set-type-powerset-Large-Locale =
is-set-type-Large-Locale powerset-Large-Locale
large-meet-semilattice-powerset-Large-Locale :
Large-Meet-Semilattice (λ l2 → l1 ⊔ lsuc l2) (λ l2 l3 → l1 ⊔ (l2 ⊔ l3))
large-meet-semilattice-powerset-Large-Locale =
large-meet-semilattice-Large-Locale powerset-Large-Locale
large-suplattice-powerset-Large-Locale :
Large-Suplattice (λ l2 → l1 ⊔ lsuc l2) (λ l2 l3 → l1 ⊔ (l2 ⊔ l3)) lzero
large-suplattice-powerset-Large-Locale =
large-suplattice-Large-Locale powerset-Large-Locale
module _
{l1 : Level} {A : UU l1}
where
leq-powerset-Large-Locale-Prop :
Large-Relation-Prop
( λ l2 → l1 ⊔ lsuc l2)
( λ l2 l3 → l1 ⊔ l2 ⊔ l3)
( type-powerset-Large-Locale A)
leq-powerset-Large-Locale-Prop =
leq-Large-Locale-Prop (powerset-Large-Locale A)
leq-powerset-Large-Locale :
Large-Relation
( λ l2 → l1 ⊔ lsuc l2)
( λ l2 l3 → l1 ⊔ l2 ⊔ l3)
( type-powerset-Large-Locale A)
leq-powerset-Large-Locale =
leq-Large-Locale (powerset-Large-Locale A)
is-prop-leq-powerset-Large-Locale :
is-prop-Large-Relation
( type-powerset-Large-Locale A)
( leq-powerset-Large-Locale)
is-prop-leq-powerset-Large-Locale =
is-prop-leq-Large-Locale (powerset-Large-Locale A)
refl-leq-powerset-Large-Locale :
is-large-reflexive
( type-powerset-Large-Locale A)
( leq-powerset-Large-Locale)
refl-leq-powerset-Large-Locale =
refl-leq-Large-Locale (powerset-Large-Locale A)
antisymmetric-leq-powerset-Large-Locale :
is-large-antisymmetric
( type-powerset-Large-Locale A)
( leq-powerset-Large-Locale)
antisymmetric-leq-powerset-Large-Locale =
antisymmetric-leq-Large-Locale (powerset-Large-Locale A)
transitive-leq-powerset-Large-Locale :
is-large-transitive
( type-powerset-Large-Locale A)
( leq-powerset-Large-Locale)
transitive-leq-powerset-Large-Locale =
transitive-leq-Large-Locale (powerset-Large-Locale A)
has-meets-powerset-Large-Locale :
has-meets-Large-Poset (large-poset-powerset-Large-Locale A)
has-meets-powerset-Large-Locale =
has-meets-Large-Locale (powerset-Large-Locale A)
meet-powerset-Large-Locale :
{l2 l3 : Level} →
type-powerset-Large-Locale A l2 →
type-powerset-Large-Locale A l3 →
type-powerset-Large-Locale A (l2 ⊔ l3)
meet-powerset-Large-Locale =
meet-Large-Locale (powerset-Large-Locale A)
is-greatest-binary-lower-bound-meet-powerset-Large-Locale :
{l2 l3 : Level}
(x : type-powerset-Large-Locale A l2)
(y : type-powerset-Large-Locale A l3) →
is-greatest-binary-lower-bound-Large-Poset
( large-poset-powerset-Large-Locale A)
( x)
( y)
( meet-powerset-Large-Locale x y)
is-greatest-binary-lower-bound-meet-powerset-Large-Locale =
is-greatest-binary-lower-bound-meet-Large-Locale (powerset-Large-Locale A)
is-large-suplattice-powerset-Large-Locale :
is-large-suplattice-Large-Poset lzero (large-poset-powerset-Large-Locale A)
is-large-suplattice-powerset-Large-Locale =
is-large-suplattice-Large-Locale (powerset-Large-Locale A)
sup-powerset-Large-Locale :
{l2 l3 : Level} {J : UU l2} (x : J → type-powerset-Large-Locale A l3) →
type-powerset-Large-Locale A (l2 ⊔ l3)
sup-powerset-Large-Locale =
sup-Large-Locale (powerset-Large-Locale A)
is-least-upper-bound-sup-powerset-Large-Locale :
{l2 l3 : Level} {J : UU l2} (x : J → type-powerset-Large-Locale A l3) →
is-least-upper-bound-family-of-elements-Large-Poset
( large-poset-powerset-Large-Locale A)
( x)
( sup-powerset-Large-Locale x)
is-least-upper-bound-sup-powerset-Large-Locale =
is-least-upper-bound-sup-Large-Locale (powerset-Large-Locale A)
distributive-meet-sup-powerset-Large-Locale :
{l2 l3 l4 : Level}
(x : type-powerset-Large-Locale A l2)
{J : UU l3} (y : J → type-powerset-Large-Locale A l4) →
meet-powerset-Large-Locale x (sup-powerset-Large-Locale y) =
sup-powerset-Large-Locale (λ j → meet-powerset-Large-Locale x (y j))
distributive-meet-sup-powerset-Large-Locale =
distributive-meet-sup-Large-Locale (powerset-Large-Locale A)
```