X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FRoots%2FFast.hs;h=b3b5818782fede0db3e6b465dc9186d8e29a1ca5;hb=1f64a1a33b2636ef2e863a0b577c8d8d50233580;hp=78c299ad6a2cc39629b409bff5eed86787a3ca20;hpb=59c49750fd2455574fe4e67ddd7e67a20321c8a8;p=numerical-analysis.git

diff --git a/src/Roots/Fast.hs b/src/Roots/Fast.hs
index 78c299a..b3b5818 100644
--- a/src/Roots/Fast.hs
+++ b/src/Roots/Fast.hs
@@ -14,7 +14,8 @@ import Normed
 
 import NumericPrelude hiding (abs)
 import qualified Algebra.Absolute as Absolute
-import qualified Algebra.Field as Field
+import qualified Algebra.Additive as Additive
+import qualified Algebra.Algebraic as Algebraic
 import qualified Algebra.RealRing as RealRing
 import qualified Algebra.RealField as RealField
 
@@ -116,9 +117,9 @@ fixed_point_iterations f x0 =
 --   We also return the number of iterations required.
 --
 fixed_point_with_iterations :: (Normed a,
-                                Field.C b,
-                                Absolute.C b,
-                                Ord b)
+                                Additive.C a,
+                                RealField.C b,
+                                Algebraic.C b)
                             => (a -> a)  -- ^ The function @f@ to iterate.
                             -> b        -- ^ The tolerance, @epsilon@.
                             -> a        -- ^ The initial value @x0@.