remove not here

Author: Tom-van-Woudenberg

book/08/sympy.ipynb

@@ -41,15 +41,6 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "````{margin}\n",
-    "```{attributiongrey} Attribution\n",
-    ":class: attribution\n",
-    "Written by [Tom van Woudenberg](https://github.com/TeachBooks/learn-python/commits/MUDE_book/book/08/sympy.ipynb)\n",
-    "\n",
-    "This page reuses CC BY content from {cite:t}`sympy`. {fa}`quote-left`[Find out more here](external_resources)\n",
-    "```\n",
-    "````\n",
-    "\n",
     "# SymPy\n",
     "\n",
     "SymPy is a Python library for symbolic mathematics. You can use it as a tool to evaluate basic and complicated math operations, whenever they become tedious or error prone.\n",