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 Author: Susobhan [ Tue Mar 10, 2015 3:05 pm ] Post subject: blowUp2 Can someone help in Computing this example of a blow-up by hand? I want to see exactly how does the blow-up looks at affine chart. LIB "resolve.lib";ring r=0,(x,y,z),dp;ideal I=z2-x^3*y^2;ideal C=z,xy;list li=blowUp2(I,C);size(li); // number of charts==> 2def S1=li[1];setring S1; // chart 1basering;==> // characteristic : 0==> // number of vars : 3==> // block 1 : ordering dp==> // : names x(1) x(3) y(2)==> // block 2 : ordering CJnew;==> Jnew[1]=x(1)*y(2)^2-1eD;==> eD[1]=x(3)==> eD[2]=x(1)*y(2)^2-1bM;==> bM[1]=x(1)==> bM[2]=x(3)*y(2)^3==> bM[3]=x(3)def S2=li[2];setring S2; // chart 2basering;==> // characteristic : 0==> // number of vars : 2==> // block 1 : ordering dp==> // : names x(2) y(1)==> // block 2 : ordering CJnew;==> Jnew[1]=0eD;==> eD[1]=x(2)*y(1)^2bM;==> bM[1]=y(1)^2==> bM[2]=x(2)==> bM[3]=x(2)*y(1)^3

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