外微分运算的宏包
http://www.inp.demokritos.gr/~sbonano/EDC/
Exterior Differential Calculus
and
Symbolic Matrix Algebra @ Mathematica
This package enables Mathematica to carry out calculations with differential forms. It defines the two basic operations - Exterior Product (Wedge) and Exterior Derivative (d) - in such a way that:
(1) they can act on any valid Mathematica expression
(2) they allow the use of any symbols to denote differential forms
(3) input - output notation is as close as possible to standard usage