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
OP-00364 Open A sharp Galerkin projection bound on nonobtuse triangles NA · AIM Open Applied Problems · Galerkin projections · hybrid high-order methods · nonobtuse triangles
OP-00494 Open A periodic nonsingular billiard trajectory in every triangle DS · AIM Open Applied Problems · periodic orbits · polygonal billiards · triangles