DOC: add separate examples for inline, block and cell output math

Author: mgeier

doc/gallery/cinque-rst.ipynb

@@ -0,0 +1,55 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "nbsphinx": "hidden"
+   },
+   "source": [
+    "This notebook is part of the `nbsphinx` documentation: https://nbsphinx.readthedocs.io/."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Dummy Notebook 5 for Gallery\n",
+    "\n",
+    "This is another dummy file to fill\n",
+    "[the gallery in the reST file](../a-normal-rst-file.rst#thumbnail-galleries).\n",
+    "\n",
+    "The thumbnail image is assigned in [conf.py](../conf.py)."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This page has a secondary use, though,\n",
+    "which is testing whether a single inline math equation works\n",
+    "(if there is no other math on the same page): $\\text{e}^{i\\pi} = -1$."
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}

doc/gallery/due-rst.pct.py

@@ -19,3 +19,13 @@
 filename = 'due-rst.pct.py'
 
 print(Path(filename).read_text())
+
+# %% [markdown]
+# This page has a secondary use,
+# which is testing whether a single math output cell works
+# (if there is no other math on the same page):
+
+# %%
+from IPython.display import Math
+eq = Math(r'\int\limits_{-\infty}^\infty f(x) \delta(x - x_0) dx = f(x_0)')
+eq

doc/gallery/uno-rst.ipynb

@@ -20,6 +20,19 @@
     "\n",
     "The thumbnail image is assigned in [conf.py](../conf.py)."
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This page has a secondary use, though,\n",
+    "which is testing whether a single block math equation works\n",
+    "(if there is no other math on the same page):\n",
+    "\n",
+    "\\begin{equation}\n",
+    "\\int\\limits_{-\\infty}^\\infty f(x) \\delta(x - x_0) dx = f(x_0).\n",
+    "\\end{equation}"
+   ]
   }
  ],
  "metadata": {