1 files changed, 26 insertions, 0 deletions
diff --git a/src/act4e_solutions/maps.py b/src/act4e_solutions/maps.py
new file mode 100644
index 0000000..4984eef
--- /dev/null
+++ b/src/act4e_solutions/maps.py
@@ -0,0 +1,26 @@
+from typing import overload, TypeVar
+
+import act4e_interfaces as I
+
+A = TypeVar("A")
+B = TypeVar("B")
+C = TypeVar("C")
+
+
+class SolFiniteMapOperations(I.FiniteMapOperations):
+    @overload
+    def identity(self, s: I.FiniteSet[A]) -> I.FiniteMap[A, A]:
+        ...
+
+    @overload
+    def identity(self, s: I.Setoid[A]) -> I.Mapping[A, A]:
+        ...
+
+    def identity(self, s: I.Setoid[A]) -> I.Mapping[A, A]:
+        raise NotImplementedError()
+
+    def compose(self, f: I.FiniteMap[A, B], g: I.FiniteMap[B, C]) -> I.FiniteMap[A, C]:
+        raise NotImplementedError()
+
+    def as_relation(self, f: I.FiniteMap[A, B]) -> I.FiniteRelation[A, B]:
+        raise NotImplementedError()