diff --git a/src/daglib/operations.py b/src/daglib/operations.py
index 0d642e5..bac9eb3 100644
--- a/src/daglib/operations.py
+++ b/src/daglib/operations.py
@@ -1,13 +1,12 @@
 from __future__ import annotations
 
 from collections.abc import Iterable
-from typing import TYPE_CHECKING, Any, TypeVar
+from typing import TYPE_CHECKING, TypeVar
 
 from .util import ensure_set
 
 if TYPE_CHECKING:
     from .dag import DAG
-    from .typing import dictset
 
 T = TypeVar("T")
 
@@ -32,12 +31,3 @@ def transitive_closure(graph: DAG[T], sub: T | Iterable[T], *, include_self: boo
         seen.update(sub)
 
     return seen
-
-
-def slice_subgraph(graph: DAG, sub: Any) -> dictset:
-    closure = transitive_closure(graph, sub)
-    return {n: d & closure for n in closure if (d := set(graph[n]))}
-
-
-def topological_sort(graph: DAG, *, reverse: bool = False) -> list:
-    return list(graph.keys())