Expression system

Classes

expression	Class to represent symbolic expressions.
dtens	Class to store derivative tensors.

Functions

make_vars(*args)	Create variable expressions from strings.
diff_tensors(func, diff_args[, diff_order])	Compute the tensors of derivatives.
subs(arg, smap)	Substitution.
sum(terms)	Multivariate summation.
prod(terms)	Multivariate product.

Attributes

par	Parameter factory.
time	Time placeholder.

Enums

diff_args

Enum for selecting differentiation arguments.