| ##### 7.5.10.0. makeUsl2 Procedure from library `ncalg.lib` (see ncalg_lib). Usage: makeUsl2([p]), p an optional integer (field characteristic) Return: ring Purpose: set up the U(sl_2) in the variables e,f,h over the field of char p Note: activate this ring with the `setring` command Example:
    LIB "ncalg.lib";
    def a=makeUsl2();
    setring a;
    a;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 3
    ==> //        block   1 : ordering dp
    ==> //                  : names    e f h
    ==> //        block   2 : ordering C
    ==> // noncommutative relations:
    ==> //    fe=ef-h
    ==> //    he=eh+2e
    ==> //    hf=fh-2f
See also: makeUg2; makeUgl; makeUsl.

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