Rob Beezer wrote:
> William,
>>
>> I think the right change for your application would be to change this
>> line in left_kernel:
>>
>>         W = V.submodule(basis)
>>
>> to
>>
>>     if echelonize:
>>          W = V.submodule(basis)
>>     else:
>>          W = V.submodule_with_basis(basis)
>>
>> then put an echelonize=True option in the left_kernel function header.
>>
>> William
>>


Just FYI, I think there is still an issue sometimes when using 
user-defined bases:

http://trac.sagemath.org/sage_trac/ticket/3058


Jason


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