Discussion
Why might a modeller try more than one encoding of the same problem?
Answer: B
Solutions correspond exactly between valid encodings, but the inferences a solver can draw differ enormously, and a problem intractable in one formulation may be easy in another. Trying two or three encodings is normal practice in industrial modelling. Solvability and language are unaffected. That two logically equivalent statements of a problem can differ by orders of magnitude in solving time is the most surprising and most practically important fact in the subject.
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