Berenstein-Zelevinsky polytopes for type $\mathrm{G}_{2}$
In 2001, Berenstein and Zelevinsky presented a polyhedral model for the problem of computing tensor-product multiplicities for semi\-simple Lie algebras. We provide explicit linear equations and inequalities for Berenstein--Zelevinsky (BZ) polytopes of type-$\mathrm{G}_{2}$ Lie algebras. We prove that the denominator of a type-$\mathrm{G}_{2}$ BZ~polytope divides $180$, and that this bound is sharp, while the quasi-period of the Ehrhart quasipolynomial of such a polytope is always a divisor of $6$. We also show that BZ~polytopes of type-$\mathrm{G}_{2}$ Lie algebras can fail to satisfy Ehrhart positivity, in contrast to a conjectured property of BZ~polytopes for all classical types.
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