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7.7.2.0. isCartan
Procedure from library central.lib (see central_lib).

Usage:
isCartan(f); f poly

Purpose:
check whether f is a Cartan element.

Return:
integer, 1 if f is a Cartan element and 0 otherwise.

Note:
f is a Cartan element of the algebra A
if and only if for all g in A there exists C in K such that [f, g] = C * g
if and only if for all variables v_i there exist C in K such that [f, v_i] = C * v_i.

Example:
 


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