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The equivariant Ehrhart theory of polytopes with order-two symmetries: Part II
We give two counterexamples to Stapledon's Effectiveness Conjecture. Each counterexample is a $6$-dimensional lattice polytope with an order-two symmetry whose equivariant $H^*$-series $φ[t]$ is a polynomial with one coefficient that is not effective. For polytopes with a symmetry of order two, the
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