setup - Maple Help

liesymm

 setup
 define the coordinates

 Calling Sequence setup(coords)

Parameters

 coords - expression sequence, list or set of strings to be used as names for coordinates

Description

 • This routine is part of the liesymm package and is loaded via with(liesymm).
 • It returns a list of the coordinates to be used in constructing wedge products and defining the actions of functions such as d().
 • If no argument is given, then all existing coordinates are removed.
 • As part of its action, the remember tables of functions such as d(), &^, Lie(), hook(), makeforms(), and wcollect() are cleared in preparation for any new definitions. It is advisable that setup be used between problems so as to keep the underlying coordinate list to a minimum size.

Examples

 > $\mathrm{with}\left(\mathrm{liesymm}\right):$
 > $\mathrm{setup}\left(\right)$
 $\left[\right]$ (1)
 > $d\left(x+y+t\right)$
 ${0}$ (2)
 > $\mathrm{setup}\left(x,y,z\right)$
 $\left[{x}{,}{y}{,}{z}\right]$ (3)
 > $a≔d\left(x+y+t\right)$
 ${a}{≔}{d}{}\left({x}\right){+}{d}{}\left({y}\right)$ (4)
 > $\mathrm{setup}\left(\right)$
 $\left[\right]$ (5)
 > $a$
 ${0}$ (6)