Singular Manual: setglobalrings

| #### D.2.9.1 setglobalrings Procedure from library `redcgs.lib` (see redcgs_lib). Usage: setglobalrings(); No arguments Return: After its call the rings @R=K[a][x], @P=K[a], @RP=K[x,a] are defined as global variables. Note: It is called by the fundamental routines of the library. The user does not need to call it, except when none of the fundamental routines have been called and some other routines of the library are used. The basering R, must be of the form K[a][x], a=parameters, x=variables, and should be defined previously. Example:
    LIB "redcgs.lib";
    ring R=(0,a,b),(x,y,z),dp;
    setglobalrings();
    @R;
    ==> // coefficients: QQ(a, b)
    ==> // number of vars : 3
    ==> //        block   1 : ordering dp
    ==> //                  : names    x y z
    ==> //        block   2 : ordering C
    @P;
    ==> // coefficients: QQ
    ==> // number of vars : 2
    ==> //        block   1 : ordering lp
    ==> //                  : names    a b
    ==> //        block   2 : ordering C
    @RP;
    ==> // coefficients: QQ
    ==> // number of vars : 5
    ==> //        block   1 : ordering dp
    ==> //                  : names    x y z
    ==> //        block   2 : ordering lp
    ==> //                  : names    a b
    ==> //        block   3 : ordering C

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