HurwitzMatrix(f,k)
This computes the $k\times k$ submatrix $H_{k}$ of the corresponding leading principal minor of the $n\times n$ Hurwitz matrix $H$ of a rational univariate polynomial f of degree n with positive leading coefficient and degree at least 1. The polynomial, however, is not necessarily from a univariate polynomial ring.
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We can also use multiple variables to represent unknown coefficients. Note that we create another ring S so that x and y are not considered variables in the same ring and so confuse the monomials $x$ or $y$ with $xy$.
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The object HurwitzMatrix is a method function.