Displaying similar documents to “On Multiset Ordering”

Fat P-sets in the Space ω*

Ryszard Frankiewicz, Magdalena Grzech, Paweł Zbierski (2005)

Bulletin of the Polish Academy of Sciences. Mathematics

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We prove that-consistently-in the space ω* there are no P-sets with the ℂ-cc and any two fat P-sets with the ℂ⁺-cc are coabsolute.

Definable Davies' theorem

Asger Törnquist, William Weiss (2009)

Fundamenta Mathematicae

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We prove the following descriptive set-theoretic analogue of a theorem of R. O. Davies: Every Σ¹₂ function f:ℝ × ℝ → ℝ can be represented as a sum of rectangular Σ¹₂ functions if and only if all reals are constructible.

PROBLEMS

M. Chrobak, M. Habib, P. John, H. Sachs, H. Zernitz, J. R. Reay, G. Sierksma, M. M. Sysło, T. Traczyk, W. Wessel (1987)

Applicationes Mathematicae

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Estimation of the noncentrality matrix of a noncentral Wishart distribution with unit scale matrix. A matrix generalization of Leung's domination result.

Heinz Neudecker (2004)

SORT

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The main aim is to estimate the noncentrality matrix of a noncentral Wishart distribution. The method used is Leung's but generalized to a matrix loss function. Parallelly Leung's scalar noncentral Wishart identity is generalized to become a matrix identity. The concept of Löwner partial ordering of symmetric matrices is used.

There is no complete axiom system for shuffle expressions

A. Szepietowski (2010)

RAIRO - Theoretical Informatics and Applications

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In this paper we show that neither the set of all valid equations between shuffle expressions nor the set of schemas of valid equations is recursively enumerable. Thus, neither of the sets can be recursively generated by any axiom system.

The Lvov years of Wacław Sierpiński

Andrzej Schinzel (2009)

Banach Center Publications

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An account is given of Sierpiński's activity in Lvov (1908-1918) interrupted by World War I.