minor change

Author: prashjha

misc/test_PriorSampler.ipynb

@@ -9,7 +9,7 @@
     "This notebook implements Poisson equation where diffusivity is uncertain and sampled from log-normal like distribution. Dependencies are mentioned in the `neuralop.yml` file in the root directory of this repository. \n",
     "\n",
     "## Problem description\n",
-    "Consider a two dimensional domain $\\Omega = (0, 1) \\times (0, 1) \\subset \\mathbb{R}^2$ and suppose $u: \\Omega \\to \\mathbf{R}$ denotes the temperature field. The differential equation for temperature field is given by:\n",
+    "Consider a two dimensional domain $D_u = (0, 1) \\times (0, 1) \\subset \\mathbb{R}^2$ and suppose $u: \\Omega \\to \\mathbf{R}$ denotes the temperature field. The differential equation for temperature field is given by:\n",
     "\\begin{equation}\\tag{1}\n",
     "    \\begin{aligned}\n",
     "        -\\nabla \\cdot \\left( m(x) \\nabla u(x) \\right) &= f(x)\\,, \\qquad &\\forall x \\in D_u\\,, \\\\\n",