add mathematical function to string function for braille and block characters

docs/source/pylib.numerical.rst

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+pylib.numerical package
+=======================
+
+Submodules
+----------
+
+pylib.numerical.fit module
+--------------------------
+
+.. automodule:: pylib.numerical.fit
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+pylib.numerical.integration module
+----------------------------------
+
+.. automodule:: pylib.numerical.integration
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+pylib.numerical.ode module
+--------------------------
+
+.. automodule:: pylib.numerical.ode
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+pylib.numerical.ode\_model module
+---------------------------------
+
+.. automodule:: pylib.numerical.ode_model
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+
+Module contents
+---------------
+
+.. automodule:: pylib.numerical
+   :members:
+   :undoc-members:
+   :show-inheritance: