Open Problems

Title	Author(s)	Imp.¹	Rec.²	Area » Topic » Subtopic	Posted by
Universal Steiner triple systems	Grannell; Griggs; Knor; Skoviera	✭✭	0	Graph Theory » Coloring » Edge coloring	macajova
Unsolvability of word problem for 2-knot complements	Gordon	✭✭✭	0	Topology	rybu
Upgrading a completary multifuncoid	Porton	✭✭	0	Topology	porton
Vertex Coloring of graph fractional powers	Iradmusa	✭✭✭	1	Graph Theory	Iradmusa
Vertex Cover Integrality Gap	Atserias	✭✭	0	Logic » Finite Model Theory	dberwanger
Wall-Sun-Sun primes and Fibonacci divisibility		✭✭	0	Number Theory » Computational N.T.	adudzik
Waring rank of determinant	Teitler	✭✭	0	Algebra	Zach Teitler
Weak pentagon problem	Samal	✭✭	0	Graph Theory » Coloring » Homomorphisms	Robert Samal
Weak saturation of the cube in the clique	Morrison; Noel	✭	1	Graph Theory » Extremal G.T.	Jon Noel
Weighted colouring of hexagonal graphs.	McDiarmid; Reed	✭✭	0	Graph Theory » Coloring » Vertex coloring	fhavet
What are hyperfuncoids isomorphic to?	Porton	✭✭	0	Topology	porton
What is the homotopy type of the group of diffeomorphisms of the 4-sphere?	Smale	✭✭✭✭	0	Topology	rybu
What is the largest graph of positive curvature?	DeVos; Mohar	✭	1	Graph Theory » Topological G.T. » Planar graphs	mdevos
What is the smallest number of disjoint spanning trees made a graph Hamiltonian	Goldengorin	✭✭	0	Graph Theory » Extremal G.T.	boris
Which compact boundaryless 3-manifolds embed smoothly in the 4-sphere?	Kirby	✭✭✭	0	Topology	rybu
Which homology 3-spheres bound homology 4-balls?	Ancient/folklore	✭✭✭✭	0	Topology	rybu
Which lattices occur as intervals in subgroup lattices of finite groups?		✭✭✭✭	0	Group Theory	williamdemeo
Which outer reloids are equal to inner ones	Porton	✭✭	0	Topology	porton
Wide partition conjecture	Chow; Taylor	✭✭	0	Combinatorics	tchow
Woodall's Conjecture	Woodall	✭✭✭	0	Graph Theory » Directed Graphs	mdevos
¿Are critical k-forests tight?	Strausz	✭✭	0	Graph Theory » Hypergraphs	Dino

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