diff -r c5d8bd1a7728 -r 0f59c0d02e13 src/kernels/ball_indicator.rs
--- a/src/kernels/ball_indicator.rs	Thu Jan 23 23:35:28 2025 +0100
+++ b/src/kernels/ball_indicator.rs	Mon Jan 06 21:37:03 2025 -0500
@@ -2,7 +2,7 @@
 //! Implementation of the indicator function of a ball with respect to various norms.
 use float_extras::f64::tgamma as gamma;
 use numeric_literals::replace_float_literals;
-use serde::Serialize;
+use serde::{Serialize, Deserialize};
 use alg_tools::types::*;
 use alg_tools::norms::*;
 use alg_tools::loc::Loc;
@@ -28,7 +28,7 @@
 
 /// Representation of the indicator of the ball $𝔹_q = \\{ x ∈ ℝ^N \mid \\|x\\|\_q ≤ r \\}$,
 /// where $q$ is the `Exponent`, and $r$ is the radius [`Constant`] `C`.
-#[derive(Copy,Clone,Serialize,Debug,Eq,PartialEq)]
+#[derive(Copy,Clone,Serialize,Deserialize,Debug,Eq,PartialEq)]
 pub struct BallIndicator<C : Constant, Exponent : NormExponent, const N : usize> {
     /// The radius of the ball.
     pub r : C,