Divisible, Torsion-Free, and Act Regular Generalized Act Wreath Products

Generalized wreath products of association schemes

Given a finite partially ordered set X, and, for each x in X, an association scheme on a set Ωx, we show how to define an association scheme on ∏ x Ωx in a way that specializes to iterated crossing and nesting when X is seriesparallel. The character table of the new association scheme is found.

The Free Trade Magic Act

In a recent paper, three economists — Drusilla Brown, Alan Deardoff, and Robert Stern — attempt to calculate the benefits of trade liberalization. They estimate that complete elimination of all trade barriers in the world would add $1.9 trillion (about 5%) to the world's gross economic product by 2005 (Brown, Deardoff, and Stern 2001). Brown-Deardoff-Stern's numbers look convincing, leaving the...

A Superposition Calculus for Divisible Torsion-Free Abelian Groups

The Conjugacy Problem in Wreath Products and Free Metabelian Groups

1. Introduction. The conjugacy problem was formulated by Dehn in 1912 for finitely presented groups [1]. The question was whether it can be effectively determined for such a group when two elements are conjugate. This general question was answered in the negative by Novikov in 1954 [6J. But it is still of interest to determine whether the problem is solvable for particular finitely presented gr...

acceptance and commitment therapy (act) for generalized anxiety disorder.

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