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LieAlgebras[MultiplicationTable] - display the multiplication table of a Lie algebra
Calling Sequences
MultiplicationTable(LieAlgebraName, keyword)
Parameters
LieAlgebraName - (optional) name or string, the name assigned to a Lie algebra
keyword - keyword string, one of "LieBracket", "ExteriorDerivative", "LieDerivative"
Description
MultiplicationTable(LieAlgebraName, keyword) displays the form of structure equations for the Lie algebra dictated by the keyword.
If the keyword is "LieBracket", then the Lie brackets [ei, ej] of the basis elements [e1, e2, ... eN] are displayed in a two dimensional array.
If the keyword is "ExteriorDerivative", then the exterior derivatives d(thetai) of the dual basis elements [theta1, theta2, ... thetaN] are printed.
If the keyword is "LieDerivative", then the Lie derivatives L_(ei) thetaj of the dual 1-forms [theta1, theta2, ... thetaN] with respect to the basis vectors [e1, e2, ...eN] are displayed in a two dimensional array.
If LieAlgebraName is omitted, then the appropriate multiplication table of the current Lie algebra is displayed.
The command MultiplicationTable is part of the DifferentialGeometry:-LieAlgebras package. It can be used in the form MultiplicationTable(...) only after executing the commands with(DifferentialGeometry) and with(LieAlgebras), but can always be used by executing DifferentialGeometry:-LieAlgebras:-MultiplicationTable(...).
Examples
Example 1.
First we initialize a 5 dimensional Lie algebra.
Display the Lie bracket multiplication table.
Display the exterior derivatives of the dual 1-forms.
Display the Lie derivatives of the dual 1-forms.
Example 2.
We initialize a 4 dimensional Lie algebra. Instead of using the standard default labels for the basis vectors we use [X, Y, U, V] and for the dual 1-forms we use [alpha, beta, sigma, tau].
See Also
DifferentialGeometry, LieAlgebras, ExteriorDerivative, LieBracket, LieDerivative
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