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(1994)If X is a class of groups, the class of counterX groups is defined to consist of all groups having no nontrivial Xquotients. Countercounterfinite groups are studied here; any nontrivial quotient of such a group has ...
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(1990)Given a semisimple linear algebraic group G over an algebraically closed field K, we fix a Borel subgroup B and a maximal torus T. This determines a root system $\Phi$, and a set of simple roots $\Delta$. The subgroups ...
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(1981)This thesis presents a classification up to topological equivalence of those flows on the torus satisfying: (1) all singular points and closed orbits are hyperbolic; and (2) there are no saddle connections. Such flows are ...
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(201405)A claw is a small graphthree edges, all sharing a common point, and nothing else.The graph pictured is claw induced saturated. It contains no claw, but claws are lurking everywhere: adding or deleting any edge will create ...
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(2006)The second main result identifies GromovHausdorff limits of certain sequences of manifoldswithboundary as Alexandrov spaces of curvature bounded below.
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(2007)A labeling of a graph is a bijective function from the set {1,2,...,E} onto the edges of the graph. The sum of the labels on edges incident to a vertex v is the vertexsum at v. A labeling is antimagic if the vertexsums ...
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(2004)Then, we consider packing problems for ddegenerate graphs. Two graphs G1 and G 2 pack if G1 is a subgraph of the complement G¯2 of G 2. We disprove one of the conjecture of Bollobas and Eldridge and prove an extension of ...
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(2004)We also show that lambda(G) = q 2 + q = Delta2  Delta for the incidence graph G of the projective plane PG (2, q). To prove this result, we convert the problem to a problem of packing of bipartite graphs into a complete ...
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(2001)An redgecoloring of Kn is (r, m)splittable if V (Kn) can then be rcolored to avoid totally monochromatic mcliques (introduced by Erdo&huml;s and Gyarfas. We interpret such colorings using a tworound game against an ...
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(1994)Combinatorial methods are used to prove several results in number theory. The chapters may be read independently, and are briefly discussed below.
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(1992)An attempt is made to study the mathematical strength of the weak second order theories of Bounded Arithmetic U$\sbsp{2}{i}$ and V$\sbsp{2}{i}$, i $\geq$ 0, introduced by S. Buss. It is first shown that U$\sbsp{2}{1}$ can ...
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Now showing items 113132 of 997