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D.5.5.21 constructH
Procedure from library resbinomial.lib (see resbinomial_lib).
- Usage:
- constructH(Hhist,n,flag);
Hhist intvec, n integer, flag list
- Return:
- the list of exceptional divisors accumulated at this chart
Example:
| | LIB "resbinomial.lib";
ring r = 0,(x(1..3)),dp;
list flag=identifyvar();
ideal J=x(1)^4*x(2)^2, x(1)^2+x(3)^3;
list L=Eresol(J); // 7 charts
// history of the exceptional divisors at the 7-th chart
L[1][7][7]; // blow ups at x(3)-th, x(1)-th and x(1)-th charts
==> 0,3,1,1
constructH(L[1][7][7],3,flag);
==> [1]:
==> _[1]=x(3)
==> [2]:
==> _[1]=1
==> [3]:
==> _[1]=x(1)
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