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Generally, assuming we have a NPC problem. Adding more constraint to it (making it more difficult), is it possible that problem become NPH? I know the difference between NPC and NPH but I don't know how to show that adding new constraints to existing NPC problem will make it NPH or still remains NPC?

Sara
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Of course can an additional constraint transform an NPC to an NPH problem. Further there could be no person on World able to proof that.

AlexWien
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  • Thanks Alex. Do you know any document or papers to show it? I am just curious to see. – Sara Nov 29 '12 at 01:31
  • sorry, no paper. but an additional contraint can be seen as a new problem. A new problem can be harder or easier to solve. – AlexWien Dec 03 '12 at 02:14