2 problems

Let $f$ be a smooth function on the three-torus, let $M_c=\{x\in\mathbb T^3\mid f(x)=c\}$ be its level surfaces, and let ${\cal E}(f)$ denote the union over $c$ of the exceptional…

Let ${\cal C}=\{4,6\,|\,4\}$ be the regular skew polyhedron considered in the paper, and let the exceptional directions be those plane directions for which the usual integrable asy…