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For questions related to problems that optimize (i.e., minimize or maximize) a linear objective subject to linear constraints.

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On the non-sufficiency of total unimodularity of the constraint matrix in the definition of ...

Is there an example of an $m\times n$ integer matrix $A$ and an integer vector $b\in \mathbb {Z}^{m}$ such that the polyhedron $P := \{ x\in \mathbb {R}^{n} \mid A x \leq b\}$ is integer, while $A$ is …
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