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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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