| ##### 7.5.10.0. makeUso7 Procedure from library `ncalg.lib` (see ncalg_lib). Usage: makeUso7([p]); p an optional integer (field characteristic) Return: a ring, describing U(so_7) Note: You have to activate this ring with the 'setring' command. The presentation of U(so_7) is derived from the Chevalley representation of so_7, positive resp. negative roots are denoted by x(i) resp. y(i); Cartan elements are denoted by h(i). Example:
    LIB "ncalg.lib";
    def ncAlgebra = makeUso7();
    ncAlgebra;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 21
    ==> //        block   1 : ordering dp
    ==> //                  : names    X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(\
       9) Y(1) Y(2) Y(3) Y(4) Y(5) Y(6) Y(7) Y(8) Y(9) H(1) H(2) H(3)
    ==> //        block   2 : ordering C
    ==> // noncommutative relations: ...
    setring ncAlgebra;
    // ...  107  noncommutative relations
See also: makeUe6; makeUe7; makeUe8; makeUf4; makeUg2; makeUsl; makeUso5; makeUsp1.

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