remove_constraint takes as input the index of the constraint to be 
removed!  It is unlikely, that add_constraint(variable==0) creates an 
indexed constraint, but perhaps I am mistaken.

Am Freitag, 13. Mai 2016 15:25:17 UTC+2 schrieb Dima Pasechnik:
>
> On Friday, May 13, 2016 at 9:53:13 AM UTC+1, Martin R wrote:
>>
>>
>> Yes, and then?  I don't think I can remove it again, can I?  
>>
>>>
>>> sage: p.remove_constraint?
>>> Docstring:
>>>    Removes a constraint from self.
>>>
>>> I do not thing that this works, because a constraint may (and often will 
>> be) subsumed by other constraints already there. 
>>
>
> It either works, or else please do a bug report...
> If you added a redundant constraint, its removal should have no effect, 
> isn't it? 
>
>

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