update Ch13

Author: rambasnet

notebooks/Ch13-Recursion.ipynb

@@ -165,12 +165,13 @@
    "metadata": {},
    "source": [
     "### Factorial definition\n",
+    "\n",
     "```\n",
-    "    0! = 1  (base case)\n",
-    "    n! = n.(n-1)! for n >= 1 (general case)\n",
+    "    1! = 1  (base case)\n",
+    "    n! = n.(n-1)! for n > 1 (general case)\n",
     "```\n",
-    "- Exercise - Implement factorial recursive solution\n",
-    " - left as an exercise"
+    "\n",
+    "- Exercise - Implement factorial recursive solution"
    ]
   },
   {