10 files changed, 28 insertions, 31 deletions
diff --git a/polymatrix/expression/expression.py b/polymatrix/expression/expression.py
index 2e7cf11..94492ef 100644
--- a/polymatrix/expression/expression.py
+++ b/polymatrix/expression/expression.py
@@ -15,7 +15,7 @@ from polymatrix.expression.mixins.variablemixin import VariableMixin
 from polymatrix.expressionstate import ExpressionState
 from polymatrix.polymatrix.abc import PolyMatrix
 from polymatrix.utils.getstacklines import get_stack_lines
-from polymatrix.variable.abc import Variable
+from polymatrix.variable import Variable
 
 from polymatrix.expression.op import (
     diff,
diff --git a/polymatrix/expression/mixins/fromsympyexprmixin.py b/polymatrix/expression/mixins/fromsympyexprmixin.py
index 6d5446a..ec28e09 100644
--- a/polymatrix/expression/mixins/fromsympyexprmixin.py
+++ b/polymatrix/expression/mixins/fromsympyexprmixin.py
@@ -10,7 +10,7 @@ from polymatrix.expressionstate import ExpressionState
 from polymatrix.polymatrix.abc import PolyMatrix
 from polymatrix.polymatrix.init import init_poly_matrix 
 from polymatrix.polymatrix.index import PolyMatrixDict, PolyDict, MonomialIndex, VariableIndex
-from polymatrix.variable.init import init_variable
+from polymatrix.variable import init_variable
 
 
 class FromSympyExprMixin(ExpressionBaseMixin):
diff --git a/polymatrix/expression/mixins/parametrizeexprmixin.py b/polymatrix/expression/mixins/parametrizeexprmixin.py
index 5ffecf3..0676cea 100644
--- a/polymatrix/expression/mixins/parametrizeexprmixin.py
+++ b/polymatrix/expression/mixins/parametrizeexprmixin.py
@@ -8,7 +8,7 @@ from polymatrix.expressionstate import ExpressionState
 from polymatrix.polymatrix.index import PolyMatrixDict, MatrixIndex, PolyDict, MonomialIndex, VariableIndex
 from polymatrix.polymatrix.init import init_poly_matrix
 from polymatrix.polymatrix.mixins import PolyMatrixMixin
-from polymatrix.variable.init import init_variable
+from polymatrix.variable import init_variable
 
 
 class ParametrizeExprMixin(ExpressionBaseMixin):
diff --git a/polymatrix/expression/mixins/variablemixin.py b/polymatrix/expression/mixins/variablemixin.py
index fe8ad80..8bc8b94 100644
--- a/polymatrix/expression/mixins/variablemixin.py
+++ b/polymatrix/expression/mixins/variablemixin.py
@@ -8,7 +8,7 @@ from polymatrix.expressionstate import ExpressionState
 from polymatrix.expression.mixins.expressionbasemixin import ExpressionBaseMixin
 from polymatrix.polymatrix.init import init_poly_matrix
 from polymatrix.polymatrix.index import PolyMatrixDict, PolyDict, MonomialIndex, VariableIndex
-from polymatrix.variable.abc import Variable
+from polymatrix.variable import Variable
 
 
 class VariableMixin(ExpressionBaseMixin, Variable):
diff --git a/polymatrix/expressionstate.py b/polymatrix/expressionstate.py
index 7d0eb26..90cb4a9 100644
--- a/polymatrix/expressionstate.py
+++ b/polymatrix/expressionstate.py
@@ -6,7 +6,7 @@ from math import prod
 from dataclassabc import dataclassabc
 from dataclasses import replace
 
-from polymatrix.variable.abc import Variable
+from polymatrix.variable import Variable
 from polymatrix.utils.deprecation import deprecated
 from polymatrix.polymatrix.index import MonomialIndex, VariableIndex
 
diff --git a/polymatrix/variable.py b/polymatrix/variable.py
new file mode 100644
index 0000000..e320313
--- /dev/null
+++ b/polymatrix/variable.py
@@ -0,0 +1,23 @@
+from abc import ABC, abstractmethod
+from dataclassabc import dataclassabc
+
+class Variable(ABC):
+    @property
+    @abstractmethod
+    def name(self) -> str:
+        """ Name of the variable. """
+
+    @property
+    @abstractmethod
+    def shape(self) -> tuple[int, int]:
+        """ Shape of the variable. """
+
+# FIXME: there is a class with the same name in expression.impl
+@dataclassabc(frozen=True)
+class VariableImpl(Variable):
+    name: str
+    shape: tuple[int, int]
+
+
+def init_variable(name: str, shape: tuple[int, int]) -> Variable:
+    return VariableImpl(name, shape)
diff --git a/polymatrix/variable/__init__.py b/polymatrix/variable/__init__.py
deleted file mode 100644
index e69de29..0000000
--- a/polymatrix/variable/__init__.py
+++ /dev/null
diff --git a/polymatrix/variable/abc.py b/polymatrix/variable/abc.py
deleted file mode 100644
index 70ad8de..0000000
--- a/polymatrix/variable/abc.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from abc import ABC, abstractmethod
-
-class Variable(ABC):
-    @property
-    @abstractmethod
-    def name(self) -> str:
-        """ Name of the variable. """
-
-    @property
-    @abstractmethod
-    def shape(self) -> tuple[int, int]:
-        """ Shape of the variable. """
-
diff --git a/polymatrix/variable/impl.py b/polymatrix/variable/impl.py
deleted file mode 100644
index 47e2041..0000000
--- a/polymatrix/variable/impl.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from dataclassabc import dataclassabc
-
-from .abc import Variable
-
-@dataclassabc(frozen=True)
-class VariableImpl(Variable):
-    name: str
-    shape: tuple[int, int]
diff --git a/polymatrix/variable/init.py b/polymatrix/variable/init.py
deleted file mode 100644
index 5583c31..0000000
--- a/polymatrix/variable/init.py
+++ /dev/null
@@ -1,5 +0,0 @@
-from .abc import Variable
-from .impl import VariableImpl
-
-def init_variable(name: str, shape: tuple[int, int]) -> Variable:
-    return VariableImpl(name, shape)