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isNZD -- tests whether a ring element is a non zerodivisor on a module

Synopsis

Usage:

t = isNZD(X,M)
Inputs:
- X, a ring element,
- M, a module,
Outputs:
- t, a Boolean value,

Description

returns true if "0 == ker (X*id_M)"

Ways to use isNZD :

isNZD(RingElement,Module)

For the programmer

The object isNZD is a method function.