clopen.solutions

Open problems

980 registered problems.

OP-00373 Open
Polynomial-size nonobtuse tetrahedral meshes
MG · AIM Open Applied Problems · mesh generation · nonobtuse tetrahedra · triangulations
OP-00651 Open
Largest radius ratio in nonuniform triangulated circle packings
MG · AIM Open Applied Problems · circle packings · triangulations
OP-00814 Solution claimed
Odd Euler characteristic for flag-no-square four-manifolds
GT · AIM Open Applied Problems · Euler characteristic · flag-no-square triangulations · four-manifolds
OP-00834 Solution claimed
Spanning triangulated spheres with holes in surface triangulations
CO · AIM Open Applied Problems · spanning subgraphs · surface triangulations · triangulated spheres with holes
OP-00846 Solution claimed
The minimum vertex number of a triangulation of real projective 5-space
CO · AIM Open Applied Problems · real projective spaces · triangulated manifolds · vertex-minimal triangulations
OP-00867 Open
A sharp Betti-number bound for 4-manifold triangulation complexity
GT · 4-manifolds · AIM Open Applied Problems · generalised triangulations · triangulation complexity
OP-00877 Open
Hardness of minimum-dilation triangulation
MG · AIM Open Applied Problems · geometric spanners · NP-hardness · triangulations
OP-00913 Open
Unimodal connectivity by 2–3 and 3–2 Pachner moves
GT · 3-manifold triangulations · AIM Open Applied Problems · Pachner moves · unimodal sequences