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7.7.12.0. 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
==> // 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.