$ for math doc win

docs/source/examples/Notebook/Typesetting Equations.ipynb

@@ -24,11 +24,11 @@
     "```\n",
     "### Display\n",
     "\n",
-    "$$\\begin{align}\n",
+    "$\\begin{align}\n",
     "\\dot{x} & = \\sigma(y-x) \\\\\n",
     "\\dot{y} & = \\rho x - y - xz \\\\\n",
     "\\dot{z} & = -\\beta z + xy\n",
-    "\\end{align}$$"
+    "\\end{align}$"
    ]
   },
   {
@@ -129,11 +129,11 @@
     "```\n",
     "### Display\n",
     "\n",
-    "\\begin{equation*}\n",
+    "$\\begin{equation*}\n",
     "1 + \\frac{q^2}{(1-q)}+\\frac{q^6}{(1-q)(1-q^2)}+\\cdots =\n",
     "\\prod_{j=0}^{\\infty}\\frac{1}{(1-q^{5j+2})(1-q^{5j+3})},\n",
     "\\quad\\quad \\text{for $|q|<1$}. \n",
-    "\\end{equation*}"
+    "\\end{equation*}$"
    ]
   },
   {