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The set of non-negative integer numbers, integer numbers and rational numbers
are denoted respectively
,
and
, as usual.
For an integer
*n* the set of the multiples of *n* (all of them:
positive, null or negative) is denoted by
*n*.
For an integer
*n* the residue class of the binary relation
(*a*, *b*) *a* *b* mod*n* is denoted by
/*n*, as usual.
For a ring
, we denote by
[*x*] the ring of univariate polynomials
in *x* with coefficients in
.

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*Marc Moreno Maza *

2006-01-09