OP-00021 Open Interior of the spectrum of the boat–star tiling Laplacian SP · aperiodic order · Cantor spectrum · graph Laplacian · Penrose tiling
OP-00027 Open Interior, edge intervals and edge regularity for the Robinson triangle tiling Laplacian SP · Cantor spectrum · graph Laplacian · integrated density of states · Penrose tiling · Robinson triangles
OP-00028 Open Spectral gaps of the Robinson triangle tiling Laplacian SP · Cantor spectrum · graph Laplacian · Penrose tiling · Robinson triangles · spectral gap