-from .linear import Constant, Symbol, symbols
-from .linear import eq, le, lt, ge, gt
-from .linear import Empty, Universe
+from .linexprs import Expression, Symbol, Dummy, symbols, Rational
+from .coordinates import Point, Vector
+from .polyhedra import Polyhedron, Eq, Ne, Le, Lt, Ge, Gt, Ne, Empty, Universe
+from .domains import Domain, And, Or, Not