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D.15.8.19 Gamma

Procedure from library resbin.lib (see resbin_lib).

Usage:
Gamma(L,c,n); L list, c number, n integer

Compute:
The Gamma function, resolution function corresponding to the monomial case

Return:
lists of maximum exponents in L, value of Gamma function, center of blow up

Example:
 
LIB "resbin.lib";
ring r = 0,(x(1..5)),dp;
ideal J=x(1)^2*x(2)*x(3)^5*x(4)^2*x(5)^3;
list L=data(J,1,5);
list G=Gamma(L[2][1][1],9,5);   // critical value c=9
G[1]; // maximum exponents in the ideal
==> [1]:
==>    5
==> [2]:
==>    3
==> [3]:
==>    2
G[2]; // maximal value of Gamma function
==> [1]:
==>    -3
==> [2]:
==>    10/9
==> [3]:
==>    3,5,4
G[3]; // center given by Gamma
==> [1]:
==>    3
==> [2]:
==>    5
==> [3]:
==>    4


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