This function returns a matrix whose columns representing a basis for
the kernel of
M
. Calling the function twice on the same input will
not necessarily produce the same output, though in each case, a basis
for the kernel is produced.
This function works only on matrices whose entries are in a field
(from version CoCoA-5.0.3).
The CoCoA-4 function returning a ZZ-basis for the kernel of
M
is not
yet implemented.
The output as it was given by CoCoA-4 (the basis of the ker) is
now given by LinKerBasis.
See also HilbertBasisKer.