1 files changed, 4 insertions, 29 deletions
diff --git a/sumofsquares/optvariable.py b/sumofsquares/optvariable.py
index cf4e99b..4c687de 100644
--- a/sumofsquares/optvariable.py
+++ b/sumofsquares/optvariable.py
@@ -3,7 +3,7 @@ from typing_extensions import override
 from dataclasses import replace
 from dataclassabc import dataclassabc
 
-from polymatrix.expression.expression import Expression, init_expression
+from polymatrix.expression.expression import VariableExpression, init_variable_expression
 from polymatrix.expression.mixins.expressionbasemixin import ExpressionBaseMixin
 from polymatrix.expressionstate.abc import ExpressionState
 from polymatrix.polymatrix.abc import PolyMatrix
@@ -39,36 +39,11 @@ class OptVariableImpl(OptVariableMixin):
 def init_opt_variable_expr(name, shape):
     return OptVariableImpl(name, shape)
 
-
-class OptVariableExpression(Expression, Variable):
-    """ 
-    Expression that is an optimization (decision) variable, i.e. an expression
-    that cannot be reduced further.
-    """
-    @override
-    @property
-    def name(self):
-        return self.underlyng.name
-
-    @override
-    @property
-    def shape(self):
-        return self.underlyng.shape
-
-
-@dataclassabc(frozen=True)
-class OptVariableExpressionImpl(OptVariableExpression):
-    underlying: ExpressionBaseMixin
-
-    def copy(self, underlying: ExpressionBaseMixin) -> Expression:
-        return init_expression(underlying)
-
-
-def init_opt_variable_expression(underlying: OptVariableMixin) -> OptVariableExpression:
-    return OptVariableExpressionImpl(underlying=underlying)
+def init_opt_variable_expression(underlying: OptVariableMixin) -> VariableExpression:
+    return init_variable_expression(underlying=underlying)
 
 
-def from_names(names: str, shape: tuple[int, int] = (1,1)) -> tuple[OptVariableExpression] | OptVariableExpression:
+def from_names(names: str, shape: tuple[int, int] = (1,1)) -> tuple[VariableExpression] | VariableExpression:
     """ Construct one or multiple variables from comma separated a list of names. """
     variables = tuple(init_opt_variable_expression(
         underlying=init_opt_variable_expr(name.strip(), shape))