857 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Hungarian Academy of SciencesHU402 papers
- Eötvös Loránd UniversityHU156 papers
- Budapest University of Technology and EconomicsHU58 papers
- Central European UniversityAT42 papers
- École Polytechnique Fédérale de LausanneCH31 papers
- Central European University - Budapest Campus24 papers
- University of PannoniaHU23 papers
- Centre National de la Recherche ScientifiqueFR21 papers
- University College LondonGB20 papers
- University of SzegedHU20 papers
- University of Illinois Urbana-ChampaignUS18 papers
- Charles UniversityCZ15 papers
25 papers · 1 filter
On Weak and Strong Interpolation in Algebraic Logics
Gabor Sagi, Saharon Shelah
We show that there is a restriction, or modification of the finite-variable fragments of First Order Logic in which a weak form of Craig's Interpolation Theorem holds, but a strong…
An efficient algorithm for positive realizations
Wojciech Czaja, Philippe Jaming, Maté Matolcsi
We observe that successive applications of known results from the theory of positive systems lead to an {\it efficient general algorithm} for positive realizations of transfer func…
A geometric estimate on the norm of product of functionals
Mate Matolcsi
The open problem of determining the exact value of the -th linear polarization constant of has received considerable attention over the past few years. This paper m…
Fuglede's conjecture fails in dimension 4
Mate Matolcsi
In this note we give an example of a set $\W\subset \R^4$ such that $L^2(\W)$ admits an orthonormal basis of exponentials $\{\frac{1}{|\W |^{1/2}}e^{2πi x, ξ}\}_{ξ\inŁ}$ for some s…
On the relation of closed forms and Trotter's product formula
Mate Matolcsi
The aim of this paper is to give a characterization in Hilbert spaces of the generators of -semigroups associated with closed, sectorial forms in terms of the convergence of a…
On the relation of Thomas rotation and angular velocity of reference frames
T. Matolcsi, M. Matolcsi, T. Tasnádi
In the extensive literature dealing with the relativistic phenomenon of Thomas rotation several methods have been developed for calculating the Thomas rotation angle of a gyroscope…
Coordinate time and proper time in the GPS
Tamas Matolcsi, Mate Matolcsi
The Global Positioning System (GPS) provides an excellent educational example as to how the theory of general relativity is put into practice and becomes part of our everyday life.…
Complementarity in quantum systems
Denes Petz
Reduction of a state of a quantum system to a subsystem gives partial quantum information about the true state of the total system. Two subalgebras A1 and A2 of B(H) are called com…
Point Estimation of States of Finite Quantum Systems
D. Petz, K. M. Hangos, A. Magyar
The estimation of the density matrix of a -level quantum system is studied when the parametrization is given by the real and imaginary part of the entries and they are estimated…
On the Casson Invariant Conjecture of Neumann--Wahl
Andras Nemethi, Tomohiro Okuma
In the article we prove the Casson Invariant Conjecture of Neumann--Wahl for splice type surface singularities. Namely, for such an isolated complete intersection, whose link is an…
On the zero mass limit of tagged particle diffusion in the 1-d Rayleigh-gas
Peter Balint, Balint Toth, Peter Toth
We consider the M -> 0 limit for tagged particle diffusion in a 1-dimensional Rayleigh-gas, studied originaly by Sinai and Soloveichik (1986), respectively by Szasz and Toth (1986)…
Small gaps between products of two primes
D. A. Goldston, S. W. Graham, J. Pintz +1
Let denote the number that is a product of exactly two distinct primes. We prove that This sharpens an earlier result…
Resolvability and monotone normality
Istvan Juhasz, Lajos Soukup, Zoltan Szentmiklossy
A space is said to be -resolvable (resp. almost -resolvable) if it contains dense sets that are pairwise disjoint (resp. almost disjoint over the ideal of nowhere den…
Resolvability of spaces having small spread or extent
Istvan Juhasz, Lajos Soukup, Zoltan Szentmiklossy
In a recent paper O. Pavlov proved the following two interesting resolvability results: (1) If a space satisfies $Δ(X) > \ps(X)$ then is maximally resolvable. (2) If a $T_3…
D-forced spaces: a new approach to resolvability
Istvan Juhasz, Lajos Soukup, Zoltan Szentmiklossy
We introduce a ZFC method that enables us to build spaces (in fact special dense subspaces of certain Cantor cubes) in which we have "full control" over all dense subsets. Using th…
Invariants of Newton non-degenerate surface singularities
Gabor Braun, Andras Nemethi
We recover the Newton diagram (modulo a natural ambiguity) from the link for any surface hypersurface singularity with non-degenerate Newton principal part whose link is a rational…
Complementary reductions for two qubits
Denes Petz, Jonas Kahn
In connection with optimal state determination for two qubits, the question was raised about the maximum number of pairwise complementary reductions. The main result of the paper t…
Representation of ideals of relational structures
C. Delhomme, M. Pouzet, G. Sagi +1
The \textit{age} of a relational structure of signature is the set of its finite induced substructures, considered up to isomorphism. This is a…
Constructions of complex Hadamard matrices via tiling Abelian groups
Máté Matolcsi, Júlia Réffy, Ferenc Szöllősi
Applications in quantum information theory and quantum tomography have raised current interest in complex Hadamard matrices. In this note we investigate the connection between tili…
The Swift satellite and redshifts of long gamma-ray bursts
Z. Bagoly, A. Mészáros, L. G. Balázs +6
Until 6 October 2005 sixteen redshifts have been measured of long gamma-ray bursts discovered by the Swift satellite. Further 45 redshifts have been measured of the long gamma-ray…
Sufficiency in quantum statistical inference. A survey with examples
Anna Jencova, Denes Petz
This paper attempts to give an overview about sufficiency in the setting of quantum statistics. The basic concepts are treated paralelly to the the measure theoretic case. It turns…
Contact Ozsvath-Szabo Invariants and Giroux Torsion
Paolo Lisca, Andras I. Stipsicz
In this paper we prove a vanishing theorem for the contact Ozsvath--Szabo invariants of certain contact 3--manifolds having positive Giroux torsion. We use this result to establish…
Oscillation of Fourier transform and Markov-Bernstein inequalities
Szilard Gy. Revesz, Noli N. Reyes, Gino Angelo M. Velasco
Under certain conditions on an integrable function f having a real-valued Fourier transform Tf=F, we obtain a certain estimate for the oscillation of F in the interval [-C||f'||/||…
A Smoothed GPY Sieve
Yoichi Motohashi, Janos Pintz
We show a smoothed version of Goldston-Pintz-Yildirim's sifting argument to detect small gaps between primes, which has a higly flexible error term. Our argument is applicable to h…