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D.5.10.2 semicont

Procedure from library spectrum.lib (see spectrum_lib).

Usage:
semicont(s,ss[,1]); list s, ss

Return:
maximal integer k such that spmul(ss,k) is semicontinous for s using half open intervals

Note:
if a third argument 1 is given, open intervals are used

Example:
 
LIB "spectrum.lib";
ring r=0,(x,y),ds;
list s=spectrumnd(x5+x2y2+y5);
s;
==> [1]:
==>    11
==> [2]:
==>    6
==> [3]:
==>    7
==> [4]:
==>    1,7,9,1,11,13,3
==> [5]:
==>    2,10,10,1,10,10,2
==> [6]:
==>    1,2,2,1,2,2,1
list ss=spectrumnd(x2+y3);
ss;
==> [1]:
==>    2
==> [2]:
==>    1
==> [3]:
==>    2
==> [4]:
==>    5,7
==> [5]:
==>    6,6
==> [6]:
==>    1,1
semicont(s,ss);
==> 3


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