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The main examples of finite generalized quadrangles (GQ’s) are essentially of five types: (1) they are inside a projective space PG(n, q) over the Galois field GF(q), and these are
Correspondence should be addressed to Salah Badraoui, [email protected] Received 11 July 2009; Accepted 5 January 2010.. Academic Editor:
By using the averaging theory of the first and second orders, we show that under any small cubic homogeneous perturbation, at most two limit cycles bifurcate from the period annulus
We classify groups generated by powers of two Dehn twists which are free, or have no “unexpectedly reducible” elements.. In the end we pose similar problems for groups generated
2, the distribution of roots of Ehrhart polynomials of edge polytopes is computed, and as a special case, that of complete multipartite graphs is studied.. We observed from
Suppose D is a linear system. On the other hand, by the definition of a system composed with a pencil, the general curve of such a system may have a singular point only at the
In fact, previous to this, discrete series representations for homogeneous spaces of reductive type have been studied only in the cases of group manifolds, reductive symmetric
Keywords Algebraic 2–complex, Wall’s D(2)–problem, geometric realiza- tion of algebraic 2–complexes, homotopy classification of 2–complexes, gen- eralized quaternion groups,
