derivation {weyl}

Derivations

Description

A derivation D of an algebra A is a linear operator that satisfies D(d_1d_2)=d_1D(d_2)+D(d_1)d_2, for every d_1,d_2\in A. If a derivation is of the form D(d)=[d,f]=df-fd for some fixed f\in A, we say that D is an inner derivation.

Function as.der() returns a derivation with as.der(f)(g)=fg-gf.

Usage

as.der(S)

Arguments

S

Weyl object

Value

Returns a function, a derivation

Author(s)

Robin K. S. Hankin

Examples

(o <- rweyl(n=2,d=2))
(f <- as.der(o))

d1 <-rweyl(n=1,d=2)
d2 <-rweyl(n=2,d=2)

f(d1*d2) == d1*f(d2) + f(d1)*d2 # should be TRUE