X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FRoots%2FFast.hs;h=0deb1fd6237a5909ea7d15a252f09b524093d1bf;hb=d52e10c90c0b8263af2e6a0152cebf0ad3c70e62;hp=78c299ad6a2cc39629b409bff5eed86787a3ca20;hpb=59c49750fd2455574fe4e67ddd7e67a20321c8a8;p=numerical-analysis.git

diff --git a/src/Roots/Fast.hs b/src/Roots/Fast.hs
index 78c299a..0deb1fd 100644
--- a/src/Roots/Fast.hs
+++ b/src/Roots/Fast.hs
@@ -14,6 +14,8 @@ import Normed
 
 import NumericPrelude hiding (abs)
 import qualified Algebra.Absolute as Absolute
+import qualified Algebra.Additive as Additive
+import qualified Algebra.Algebraic as Algebraic
 import qualified Algebra.Field as Field
 import qualified Algebra.RealRing as RealRing
 import qualified Algebra.RealField as RealField
@@ -116,9 +118,9 @@ 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)
+                                Algebraic.C a,
+                                RealField.C b,
+                                Algebraic.C b)
                             => (a -> a)  -- ^ The function @f@ to iterate.
                             -> b        -- ^ The tolerance, @epsilon@.
                             -> a        -- ^ The initial value @x0@.