An Orlik-Solomon type algebra for matroids with a fixed linear class of circuits
An orthogonal polynomial coefficient formula for the Hankel transform
An Overpartition Analogue of Bressoud's Theorem of Rogers-Ramanujan Type
An overview of domino and lozenge tilings
An S_3-symmetric Littlewood-Richardson rule
An ultrafilter approach to Jin's Theorem
An uncertainty inequality for finite abelian groups
An undecidability result on limits of sparse graphs
An Undecidable Nested Recurrence Relation
An update on the Hirsch conjecture
An update on the middle levels problem
An upper bound for Cubicity in terms of Boxicity
An upper bound for permanents of nonnegative matrices
An upper bound for the number of independent sets in regular graphs
An upper bound for the number of perfect matchings in graphs
An Upper Bound for the Number of Planar Lattice Triangulations
An Upper Bound on the Minimum Weight of Type II $\ZZ_{2k}$-Codes
An upper bound on the multiplicative energy
An upper bound on the number of high-dimensional permutations
An Upper bound on the number of Steiner triple systems