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Given the polynomials f, g ∈ Z[x] the main result of our paper,
Theorem 1, establishes a direct one-to-one correspondence between the
modified Euclidean and Euclidean polynomial remainder sequences (prs’s) of f, g
computed in Q[x], on one hand, and the subresultant prs of f, g computed
by determinant evaluations in Z[x], on the other.
An important consequence of our theorem is that the signs of Euclidean
and modified Euclidean prs’s - computed either in Q[x] or in Z[x] -
are uniquely determined...
In this paper we present two new methods for computing the
subresultant polynomial remainder sequence (prs) of two polynomials f, g ∈ Z[x].
We are now able to also correctly compute the Euclidean and modified
Euclidean prs of f, g by using either of the functions employed by our
methods to compute the remainder polynomials.
Another innovation is that we are able to obtain subresultant prs’s in
Z[x] by employing the function rem(f, g, x) to compute the remainder
polynomials in [x]. This is achieved...
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