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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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