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Mostrando ítems 1-9 de 9
Artículo
Triangle-Free Planar Graphs as Segments Intersection Graphs
(1999)
We prove that every triangle-free planar graph is the graph of intersection of a set of segments in the plane. Moreover, the segments can be chosen in only three directions (horizontal, vertical and oblique) and in such a ...
Artículo
On p-minimal homological models of twisted tensor products of elementary complexes localised over a prime
(American Mathematical Society, 1999)
In this paper, working over Z(p) and using algebra perturbation results from [18], p-minimal homological models of twisted tensor products (TTPs) of Cartan’s elementary complexes are obtained. Moreover, making use of the ...
Artículo
3-filiform Lie algebras of dimension 8
(L'université Blaise Pascal, 1999)
We give, up to isomorphism and in dimension 8, all the 3-filiform Lie algebras (whose Goze’s invariant is (n - 3,1,1,1))..
Artículo
Geometric tree graphs of points in convex position
(1999)
Given a set P of points in the plane, the geometric tree graph of P is defined as the graph T(P) whose vertices are non-crossing spanning with straight edges trees of P, and where two trees T1 and T2 are adjacent if T2 = ...
Artículo
Artículo
Liaison-psychiatry: Reasons for consultation, diagnosis, and differences between medical and surgical patients
(Cambridge University Press, 1999)
Artículo
A combinatorial method for computing Steenrod squares
(Elsevier, 1999)
We present here a combinatorial method for computing Steenrod squares of a simplicial set X. This method is essentially based on the determination of explicit formulae for the component morphisms of a higher diagonal ...
Artículo
On the connectivity of infinite graphs and 2-complexes
(Elsevier, 1999)
This paper contains a study of the connectivity of infinite graphs and 2-complexes. Various connectivity types are defined and relationships among them are given. In addition new Menger-Whitney type theorems are stated for ...
Artículo
Inmersiones condicionadas de grafos en superficies y seudosuperficies
(1999)
En este traba jo se procede a recapitular resultados conocidos sobre el problema de caracterizar los grafos que admiten inmersiones en super cies y en seudosuper - cies con todos los v ertices en la misma cara y se da ...