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D.11.2.13 wUnit

Procedure from library atkins.lib (see atkins_lib).

Usage:
wUnit(D);

Return:
the number of roots of unity in the quadratic order of discriminant D

Assume:
D<0 a discriminant kongruent to 0 or 1 modulo 4

Example:
 
LIB "atkins.lib";
ring r = 0,x,dp;
number D=-3;
wUnit(D);
==> 6