diff -r b4a47e8e80d1 -r fd9dba51afd3 src/bisection_tree/btfn.rs
--- a/src/bisection_tree/btfn.rs	Wed Sep 03 09:52:30 2025 -0500
+++ b/src/bisection_tree/btfn.rs	Wed Sep 03 10:08:28 2025 -0500
@@ -66,7 +66,7 @@
     G::SupportType: LocalAnalysis<F, BT::Agg, N>,
     BT: BTImpl<N, F>,
 {
-    type OwnedSpace = Self;
+    type Principal = Self;
     type Decomp = BasicDecomposition;
 }