D.6.1.5 cyclotomic
..................
Procedure from library finvar.lib (see finvar_lib).

Usage:
cyclotomic(i); i integer > 0

Returns:
the i-th cyclotomic polynomial (type <poly>) as one in the first ring
variable

Theory:
x^i-1 is divided by the j-th cyclotomic polynomial where j takes on
the value of proper divisors of i

Example:
LIB "finvar.lib";
ring R=0,(x,y,z),dp;
print(cyclotomic(25));
==> x20+x15+x10+x5+1

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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
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