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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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