2 problems

Fenn graph conjecture. For every rectangle, and more generally for every such cyclic quadrilateral $Q$, there exists a rigid motion $T$ such that

A Fenn graph is the graph $G(f)$ of a continuous map $f:\mathbb{R}^{2}\to\mathbb{R}$ over a compact convex domain $D\subset\mathbb{R}^{2}$ satisfying Fenn's boundary conditions. Le…