Blurb::
Use a total-order index set to construct a polynomial chaos expansion.
Description::
Use the traditional total-order index set to construct a polynomial chaos expansion. That is for a given order :math:`p`  keep all terms with a :math:`d` -dimensional multi index :math:`\mathbf{i}=(i_1,\ldots,i_d)`  that satisfies

.. math:: 

   \sum_{k=1}^d i_k \le p


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