diff --git a/notebooks/convergence_testing_2024-03-13/wsd.ipynb b/notebooks/convergence_testing_2024-03-13/wsd.ipynb
index 14c64a6..bdf4726 100644
--- a/notebooks/convergence_testing_2024-03-13/wsd.ipynb
+++ b/notebooks/convergence_testing_2024-03-13/wsd.ipynb
@@ -2115,12 +2115,12 @@
     "This is a special case of the generalized lasso.\n",
     "Our penalized problem is\n",
     "$$\n",
-    "\\min_{\\beta} f(\\beta) + \\lambda\\|D\\beta\\|_1,\n",
+    "\\min_{\\beta} f(\\beta) + \\lambda\\|\\mathfrak{D}\\beta\\|_1,\n",
     "$$\n",
     "where $f$ is the smooth piece of the objective.\n",
     "To use FISTA, we'll need the gradient $\\nabla f$ and the proximal operator $\\mathrm{prox}_{\\lambda}$, defined as\n",
     "$$\n",
-    "\\mathrm{prox}_{\\lambda}(x) = \\arg\\min_{y}\\frac{1}{2}\\|x - y\\|_2^2 + \\lambda\\|Dy\\|_1,\n",
+    "\\mathrm{prox}_{\\lambda}(x) = \\arg\\min_{y}\\frac{1}{2}\\|x - y\\|_2^2 + \\lambda\\|\\mathfrak{D}y\\|_1,\n",
     "$$\n",
     "which is equivalent to the constrained problem\n",
     "$$\n",