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Draco–Sadun–Van Wieren real-spectrum conjecture for the quaquaversal operator
Draco–Sadun–Van Wieren conjecture. The associated operators $\pi_{2k+1}(z)$ always have a real spectrum.
Conjectureopenquaquaversal-tilings representation-theory spectral-theoryarXiv posted 3 days ago

Draco–Sadun–Van Wieren real-spectrum conjecture for the quaquaversal operator