Blurb::
Use a tensor-product index set to construct a polynomial chaos expansion.
Description::
Use a tensor-product index set to construct a polynomial chaos expansion. That is for a given order \f$p\f$ keep all terms with \f$d\f$-dimensional multi index \f$\mathbf{i}=(i_1,\ldots,i_d)\f$ that satisfies
\f[
\max \,(i_1,\ldots,i_d) \le p
\f]
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