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Filling words in fundamental groups of Riemann surfaces

Studia Scientiarum Mathematicarum Hungarica
Author: C. Zhang

The purpose of this article is to utilize some exiting words in the fundamental group of a Riemann surface to acquire new words that are represented by filling closed geodesics.

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A non representable infinite dimensional quasi-polyadic equality algebra with a representable cylindric reduct

Studia Scientiarum Mathematicarum Hungarica
Authors: Hajnal Andréka, István Németi, and Tarek Ahmed

We construct an infinite dimensional quasi-polyadic equality algebra \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage{bbm} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $\mathfrak{A}$ \end{document} such that its cylindric reduct is representable, while \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage{bbm} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $\mathfrak{A}$ \end{document} itself is not representable.

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On an open problem by Nasr-Isfahani on strict inner amenability

Studia Scientiarum Mathematicarum Hungarica
Authors: Mohammad Ghanei and Mehdi Nemati

For two locally compact groups G and H, we show that if L 1(G) is strictly inner amenable, then L 1(G × H) is strictly inner amenable. We then apply this result to show that there is a large class of locally compact groups G such that L 1(G) is strictly inner amenable, but G is not even inner amenable.

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Some properties of local homology and local cohomology modules

Studia Scientiarum Mathematicarum Hungarica
Author: Tran Nam

We study some properties of representable or I-stable local homology modules H i I (M) where M is a linearly compact module. By duality, we get some properties of good or at local cohomology modules H I i (M) of A. Grothendieck.

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The sub-bifractional Brownian motion

Studia Scientiarum Mathematicarum Hungarica
Authors: Charles El-Nouty and Jean-Lin Journé

The sub-bifractional Brownian motion, which is a quasi-helix in the sense of Kahane, is presented. The upper classes of some of its increments are characterized by an integral test.

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Weak convergence of random walks, conditioned to stay away from small sets

Studia Scientiarum Mathematicarum Hungarica
Authors: Zsolt Pajor-Gyulai and Domokos Szász

Let {X n}n∈ℕ be a sequence of i.i.d. random variables in ℤd. Let S k = X 1 + … + X k and Y n(t) be the continuous process on [0, 1] for which Y n(k/n) = S k/n 1/2 for k = 1, … n and which is linearly interpolated elsewhere. The paper gives a generalization of results of () on the weak limit laws of Y n(t) conditioned to stay away from some small sets. In particular, it is shown that the diffusive limit of the random walk meander on ℤd: d ≧ 2 is the Brownian motion.

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Characterizations of the Amoroso distribution

Studia Scientiarum Mathematicarum Hungarica
Author: G. Hamedani

Characterizations of the Amoroso distribution based on a simple relationship between two truncated moments are presented. A remark regarding the characterization of certain special cases of the Amoroso distribution based on hazard function is given. We will also point out that a sub-family of the Amoroso family is a member of the generalized Pearson system.

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Fundamental group of Desargues configuration spaces

Studia Scientiarum Mathematicarum Hungarica
Authors: Barbu Berceanu and Saima Parveen

We compute the fundamental group of various spaces of Desargues configurations in complex projective spaces: planar and non-planar configurations, with a fixed center and also with an arbitrary center.

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Joint distributions of circular runs of various lengths based on multi-colour Pólya urn model

Studia Scientiarum Mathematicarum Hungarica
Author: Sonali Bhattacharya

In this paper, we have used Eryilmaz’s (2008) multi-colour Pólya urn model to obtain joint distributions of runs of t-types of exact lengths (k 1, k 2, …, k t), at least lengths (k 1, k 2, …, k t), non-overlapping runs of lengths (k 1, k 2, … k t) and overlapping runs of lengths (k 1, k 2, … k t) when counting of runs is done in a circular setup. We have also derived joint distributions of longest runs of various types under similar conditions. Distributions of runs have found applications in fields of reliability of consecutive-k-out-of n: F system, consecutive k-out-of-r-from n: F system, start-up demonstration test, molecular biology, radar detection, time sharing systems and quality control. The literature is profound in discussion of marginal distribution and joint distribution of runs of various types under linear and circular setup using techniques like urn model with balls of two or more colours, probability generating function and compounding discrete distribution with suitable beta functions. Through this paper for first time effort been made to discuss joint distributions of runs of various lengths and types using Multi-colour urn model.

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The largest family of subsets satisfying sequential-evaluation convergence

Studia Scientiarum Mathematicarum Hungarica
Authors: Aihong Chen and Ronglu Li

Suppose X is a locally convex space, Y is a topological vector space and λ(X)βY is the β-dual of some X valued sequence space λ(X). When λ(X) is c 0(X) or l (X), we have found the largest M ⊂ 2λ(X) for which (A j) ∈ λ(X)βY if and only if Σ j=1 A j(x j) converges uniformly with respect to (x j) in any MM. Also, a remark is given when λ(X) is l p(X) for 0 < p < + ∞.

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