NCLeftIdeal -- Type of a left ideal in a noncommutative ring

Description

This defines a left ideal in a noncommutative ring. Not much can be done with these objects at this point (as one can tell by the dearth of operations that take an NCLeftIdeal as input), , but eventually it will be a 'fully featured' object.

Methods that use an object of class NCLeftIdeal :

basis(ZZ,NCLeftIdeal) -- Returns a basis of an NCLeftIdeal in a particular degree.
generators(NCLeftIdeal) -- Returns the generators of an NCLeftIdeal
isHomogeneous(NCLeftIdeal) -- see isHomogeneous(NCIdeal) -- Determines whether the input defines a homogeneous object
NCLeftIdeal + NCLeftIdeal -- Sum of NCLeftIdeals
ring(NCLeftIdeal) -- Returns the ring of an NCLeftIdeal

For the programmer

The object NCLeftIdeal is a type, with ancestor classes HashTable < Thing.