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D.4.9.4 closureRingtower

Procedure from library reesclos.lib (see reesclos_lib).

Usage:
closureRingtower(list L); L a list of rings

Create:
rings R(1),...,R(n) such that R(i)=L[i] for all i

Example:
 
LIB "reesclos.lib";
ring R=0,(x,y),dp;
ideal I=x4,y4;
list L=primeClosure(ReesAlgebra(I)[1]);
closureRingtower(L);
R(1);
==> //   characteristic : 0
==> //   number of vars : 4
==> //        block   1 : ordering dp
==> //                  : names    x y U(1) U(2) 
==> //        block   2 : ordering C
R(4);
==> //   characteristic : 0
==> //   number of vars : 7
==> //        block   1 : ordering a
==> //                  : names    T(1) T(2) T(3) T(4) T(5) T(6) T(7) 
==> //                  : weights     1    1    1    1    1    1    1 
==> //        block   2 : ordering dp
==> //                  : names    T(1) T(2) T(3) T(4) T(5) T(6) T(7) 
==> //        block   3 : ordering C


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