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7.7.10.0. makeUf4
Procedure from library ncalg.lib (see ncalg_lib).

Usage:
makeUf4([p]); p an optional integer (field characteristic)

Return:
a ring, describing U(f_4)

Note:
You have to activate this ring with the 'setring' command. The presentation of U(f_4) is derived from the Chevalley representation of f_4, positive resp. negative roots are denoted by x(i) resp. y(i); Cartan elements are denoted by h(i).

Example:
 
See also: makeUe6; makeUe7; makeUe8; makeUg2; makeUsl; makeUso5; makeUsp1.


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