Revert "Fix circular imports caused by type annotations"

This reverts commit f3d55a7bf8052ecd49386ae4bc49f9a44c7a8c20.

1 files changed, 1 insertions, 5 deletions

diff --git a/polymatrix/expression/mixins/derivativeexprmixin.py b/polymatrix/expression/mixins/derivativeexprmixin.py
index 301166a..31a1e31 100644
--- a/polymatrix/expression/mixins/derivativeexprmixin.py
+++ b/polymatrix/expression/mixins/derivativeexprmixin.py
@@ -1,14 +1,10 @@
-from __future__ import annotations
-
 import abc
 import typing
 
-if typing.TYPE_CHECKING:
-    from polymatrix.expressionstate.abc import ExpressionState
-
 from polymatrix.polymatrix.init import init_poly_matrix
 from polymatrix.expression.mixins.expressionbasemixin import ExpressionBaseMixin
 from polymatrix.polymatrix.abc import PolyMatrix
+from polymatrix.expressionstate.abc import ExpressionState
 from polymatrix.expression.utils.getderivativemonomials import differentiate_polynomial
 from polymatrix.expression.utils.getvariableindices import (
     get_variable_indices_from_variable,