In this paper we study the conjugacy problem in polycyclic groups. Our main result is that we create polycyclic groups Gn whose conjugacy problem is at least as hard as the subset sum problem with n indeterminates. As such, the conjugacy problem over the groups Gn is NP-complete where the parameters of the problem are taken in terms of n and the length of the elements given on input.

We present a denotational semantics for anAlgol like languageAlg which is fully abstract for the second order subset of Alg This constitutes the rst signi cant full abstraction result for a block structured language with local variables As all the published test equivalences for Algol like languages are contained in the second order subset they can all be validated easily in our denotational mo...

Regulatory CD25(+)CD4+ T cells (Treg cells) are a central element of peripheral tolerance. Little is known, however, about phenotypic and functional characteristics of these cells with regard to memory. In this study we show that the chemokine receptor CCR6 is expressed on a distinct subset of mouse Treg cells. Similar to their CD25- counterparts, CCR6+ Treg cells exhibit markers of activation,...

In this article, we consider an iterated functions system on the non-Euclidean real projective plane which has a linear structure. Then, study fractal dimension of associated curve as subset space and like set Euclidean space. At end, initiate dual function pose open problem.

IAl > ((l/k) + E)n then there is a subset B L A such that 0 < 1 BI 0, let snd(nt) denote the smallest integer that does not divide PI. We prove that for every I-: > 0 there is a constant c = ~(8:) z I, such that for every n > 0 and every rn, n ' +' 6 WI < n'llog'n...