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D.12.6.3 symsignature
Procedure from library rootsmr.lib (see rootsmr_lib).
- Usage:
- symsignature(m); m matrix. m must be symmetric.
- Return:
- int: the signature of m
Example:
| LIB "rootsmr.lib";
ring r = 0,(x,y),dp;
ideal i = x4-y2x,y2-13;
i = std(i);
ideal b = qbase(i);
matrix m = matbil(1,b,i);
symsignature(m);
==> 4
| See also:
matbil;
sturmquery.
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