1 files changed, 16 insertions, 0 deletions
diff --git a/sumofsquares/sosconstraint/mixins.py b/sumofsquares/sosconstraint/mixins.py
new file mode 100644
index 0000000..be49620
--- /dev/null
+++ b/sumofsquares/sosconstraint/mixins.py
@@ -0,0 +1,16 @@
+import abc
+import polymatrix
+
+from sumofsquares.sosexprbase.mixins.parametermixin import ParameterMixin
+
+
+class SOSConstraintMixin(abc.ABC):
+    @property
+    @abc.abstractmethod
+    def dependence(self) -> tuple[ParameterMixin]:
+        ...
+
+    @property
+    @abc.abstractmethod
+    def constraint(self) -> polymatrix.Expression:
+        ...