Add next_whats_new entries for mathtext features (#26418)

devRD · QuLogic · web-flow · commit a92b7842ccb7 · 2023-08-01T17:05:58.000-04:00
* Add next_whats_new entries for mathtext features

* Update doc/users/next_whats_new/mathtext_features.rst

Co-authored-by: Elliott Sales de Andrade &lt;quantum.analyst@gmail.com&gt;

* Update doc/users/next_whats_new/mathtext_features.rst

Co-authored-by: Elliott Sales de Andrade &lt;quantum.analyst@gmail.com&gt;

---------

Co-authored-by: Elliott Sales de Andrade &lt;quantum.analyst@gmail.com&gt;
diff --git a/doc/users/next_whats_new/mathtext_features.rst b/doc/users/next_whats_new/mathtext_features.rst
@@ -0,0 +1,32 @@
+``mathtext`` now supports ``\substack``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``\substack`` can be used to create multi-line subscripts or superscripts within an equation.
+
+To use it to enclose the math in a substack command as shown:
+
+.. code-block::
+
+    r'$\sum_{\substack{1\leq i\leq 3\\ 1\leq j\leq 5}}$'
+
+.. mathmpl::
+
+    \sum_{\substack{1\leq i\leq 3\\ 1\leq j\leq 5}}
+
+
+``mathtext`` now supports ``\middle`` delimiter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``\middle`` delimiter has been added, and can now be used with the
+``\left`` and ``\right`` delimiters:
+
+To use the middle command enclose it in between the ``\left`` and
+``\right`` delimiter command as shown:
+
+.. code-block::
+
+    r'$\left( \frac{a}{b} \middle| q \right)$'
+
+.. mathmpl::
+
+    \left( \frac{a}{b} \middle| q \right)
