File: Local.hs

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haskell-algebra 2.1.1.2-1
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module Numeric.Ring.Local 
  ( LocalRing 
  ) where

import Numeric.Ring.Class

-- forall x in r, either x or 1 - x is a unit.
-- if a finite sum is a unit then so are some of its terms, so the empty sum is not a unit, and one /= zero.
class Ring r => LocalRing r