Three amalgams of A_5
Panagiotis Papadopoulos (1999)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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Panagiotis Papadopoulos (1999)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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Andrew Kepert (1994)
Studia Mathematica
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The existence of a projection onto an ideal I of a commutative group algebra depends on its hull Z(I) ⊆ Ĝ. Existing methods for constructing a projection onto I rely on a decomposition of Z(I) into simpler hulls, which are then reassembled one at a time, resulting in a chain of projections which can be composed to give a projection onto I. These methods are refined and examples are constructed to show that this approach does not work in general. Some answers are also given to previously...
A. Charalambopoulos, K. A. Anagnostopoulos (2004)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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Imre Ruzsa (1988)
Acta Arithmetica
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Bessy Dim. Athanasopoulos (2000)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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Krzysztof Bogdan, Tomasz Byczkowski (1999)
Studia Mathematica
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The purpose of the paper is to extend results of the potential theory of the classical Schrödinger operator to the α-stable case. To obtain this we analyze a weak version of the Schrödinger operator based on the fractional Laplacian and we prove the Conditional Gauge Theorem.
Hermann Render, Andreas Sauer (1996)
Studia Mathematica
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A systematic investigation of algebras of holomorphic functions endowed with the Hadamard product is given. For example we show that the set of all non-invertible elements is dense and that each multiplicative functional is continuous, answering some questions in the literature.
B. C. Dhage (2005)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
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Pascal Lefèvre (1999)
Studia Mathematica
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We establish new connections between some classes of lacunary sets. The main tool is the use of (p,q)-summing or weakly compact operators (for Riesz sets). This point of view provides new properties of stationary sets and allows us to generalize to more general abelian groups than the torus some properties of p-Sidon sets. We also construct some new classes of Riesz sets.