An Eulerian partner for inversions.
An even side analogue of Room squares.
An evolutionary formulation of the crossing number problem.
An exact performance bound for an time greedy matching procedure.
An Exchange Property For The Submodular Systems.
An explanatory bijection of some properties of bridges. (Une bijection explicative de plusieurs propriétés de ponts.)
An exploration of the permanent-determinant method.
An extension of a criterion for unimodality.
An extension of Franklin's bijection.
An Extension of Kotzig’s Theorem
In 1955, Kotzig proved that every 3-connected planar graph has an edge with the degree sum of its end vertices at most 13, which is tight. An edge uv is of type (i, j) if d(u) ≤ i and d(v) ≤ j. Borodin (1991) proved that every normal plane map contains an edge of one of the types (3, 10), (4, 7), or (5, 6), which is tight. Cole, Kowalik, and Škrekovski (2007) deduced from this result by Borodin that Kotzig’s bound of 13 is valid for all planar graphs with minimum degree δ at least 2 in which every...
An extension of Kotzig’s theorem on the minimum weight of edges in -polytopes
An extension of matroid rank submodularity and the -Rayleigh property.
An extension of the exponential formula in enumerative combinatorics.
An extension of the Foata map to standard Young tableaux.
An extension of the Ramanujan-Bailey formula. (Une extension d'une formule de Ramanujan-Bailey.)
An extremal characterization of projective planes.
An extremal problem for some classes of oriented graphs
An extremal problem on potentially -graphic sequences.
An extremal property of Turán graphs.
An extremal result for graphs with an application to their colourings.