diff -r bd924d62d952 -r a0db98c16ab5 src/bisection_tree/support.rs
--- a/src/bisection_tree/support.rs	Wed Nov 06 15:34:17 2024 -0500
+++ b/src/bisection_tree/support.rs	Sat Nov 09 20:36:23 2024 -0500
@@ -146,19 +146,19 @@
 }
 
 impl<'a, T, V, F : Float, const N : usize> Differentiable<&'a Loc<F, N>> for Shift<T,F,N>
-where T : Differentiable<Loc<F, N>, Output=V> {
-    type Output = V;
+where T : Differentiable<Loc<F, N>, Derivative=V> {
+    type Derivative = V;
     #[inline]
-    fn differential(&self, x : &'a Loc<F, N>) -> Self::Output {
+    fn differential(&self, x : &'a Loc<F, N>) -> Self::Derivative {
         self.base_fn.differential(x - &self.shift)
     }
 }
 
 impl<'a, T, V, F : Float, const N : usize> Differentiable<Loc<F, N>> for Shift<T,F,N>
-where T : Differentiable<Loc<F, N>, Output=V> {
-    type Output = V;
+where T : Differentiable<Loc<F, N>, Derivative=V> {
+    type Derivative = V;
     #[inline]
-    fn differential(&self, x : Loc<F, N>) -> Self::Output {
+    fn differential(&self, x : Loc<F, N>) -> Self::Derivative {
         self.base_fn.differential(x - &self.shift)
     }
 }
@@ -251,23 +251,23 @@
 }
 
 impl<'a, T, V, F : Float, C, const N : usize> Differentiable<&'a Loc<F, N>> for Weighted<T, C>
-where T : for<'b> Differentiable<&'b Loc<F, N>, Output=V>,
+where T : for<'b> Differentiable<&'b Loc<F, N>, Derivative=V>,
       V : std::ops::Mul<F, Output=V>,
       C : Constant<Type=F> {
-    type Output = V;
+    type Derivative = V;
     #[inline]
-    fn differential(&self, x : &'a Loc<F, N>) -> Self::Output {
+    fn differential(&self, x : &'a Loc<F, N>) -> Self::Derivative {
         self.base_fn.differential(x) * self.weight.value()
     }
 }
 
 impl<'a, T, V, F : Float, C, const N : usize> Differentiable<Loc<F, N>> for Weighted<T, C>
-where T : Differentiable<Loc<F, N>, Output=V>,
+where T : Differentiable<Loc<F, N>, Derivative=V>,
       V : std::ops::Mul<F, Output=V>,
       C : Constant<Type=F> {
-    type Output = V;
+    type Derivative = V;
     #[inline]
-    fn differential(&self, x : Loc<F, N>) -> Self::Output {
+    fn differential(&self, x : Loc<F, N>) -> Self::Derivative {
         self.base_fn.differential(x) * self.weight.value()
     }
 }