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agdaproofs/Rings/Orders/Total/Cauchy.agda
2020-04-11 19:46:26 +01:00

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{-# OPTIONS --safe --warning=error --without-K --guardedness #-}
open import Agda.Primitive using (Level; lzero; lsuc; _⊔_)
open import Setoids.Setoids
open import Rings.Definition
open import Rings.Orders.Partial.Definition
open import Rings.Orders.Total.Definition
open import Groups.Definition
open import Sets.EquivalenceRelations
open import Sequences
open import Setoids.Orders
open import Functions
open import LogicalFormulae
open import Numbers.Naturals.Semiring
open import Numbers.Naturals.Order
module Rings.Orders.Total.Cauchy {m n o : _} {A : Set m} {S : Setoid {m} {n} A} {_+_ : A A A} {_*_ : A A A} {_<_ : Rel {m} {o} A} {pOrder : SetoidPartialOrder S _<_} {R : Ring S _+_ _*_} {pRing : PartiallyOrderedRing R pOrder} (order : TotallyOrderedRing pRing) where
open Setoid S
open SetoidTotalOrder (TotallyOrderedRing.total order)
open SetoidPartialOrder pOrder
open Equivalence eq
open TotallyOrderedRing order
open Ring R
open Group additiveGroup
open import Rings.Orders.Total.Lemmas order
cauchy : Sequence A Set (m o)
cauchy s = (ε : A) (0R < ε) Sg (λ N {m n : } (N <N m) (N <N n) abs ((index s m) -R (index s n)) < ε)