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Search Results: 1 - 10 of 2011 matches for " Mihai Popa "
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Freeness with amalgamation, limit theorems and S-transform in non-commutative probability spaces of type B
Mihai Popa
Mathematics , 2007,
Abstract: The present material addresses several problems left open in the Trans. AMS paper " Non-crossing cumulants of type B" of P. Biane, F. Goodman and A. Nica. The main result is that a type B non-commutative probability space can be studied in the framework of freeness with amalgamation. This view allows easy ways of constructing a version of the S-transform as well as proving analogue results to Central Limit Theorem and Poisson Limit Theorem.
A new proof for the multiplicative property of the boolean cumulants with applications to operator-valued case
Mihai Popa
Mathematics , 2008,
Abstract: The paper presents several combinatorial properties of the boolean cumulants. A corollary is a new proof of the multiplicative property of the boolean cumulant series that can be easily adapted for the case of boolean independence with amalgamation over an algebra.
Non-crossing linked partitions and multiplication of free random variables
Mihai Popa
Mathematics , 2008,
Abstract: The material gives a new combinatorial proof of the multiplicative property of the S-transform. In particular, several properties of the coefficients of its inverse are connected to non-crossing linked partitions and planar trees.
A Fock Space Model for Addition and Multiplication of C-free Random Variables
Mihai Popa
Mathematics , 2010,
Abstract: The paper presents a Fock space model suitable for constructions of c-free algebras. Immediate applications are direct proofs for the properties of the c-free R- and S-transforms.
Multilinear function series in conditionally free probability with amalgamation
Mihai Popa
Mathematics , 2007,
Abstract: As in the cases of freeness and monotonic independence, the notion of conditional freeness is meaningful when complex-valued states are replaced by positive conditional expectations. In this framework, the paper presents several positivity results, a version of the central limit theorem and an analogue of the conditionally free R-transform constructed by means of multilinear function series.
A combinatorial approach to monotonic independence over a C*-algebra
Mihai Popa
Mathematics , 2006,
Abstract: The notion of monotonic independence, introduced by N. Muraki, is considered in a more general frame, similar to the construction of operator-valued free probability. The paper presents constructions for maps with similar properties to the H and K transforms from the literature, semi inner-product bimodule analogues for the monotone and weakly monotone product of Hilbert spaces, an ad-hoc version of the Central Limit Theorem, an operator-valued arsine distribution as well as a connection to operator-valued conditional freeness.
Realization of conditionally monotone independence and monotone products of completely positive maps
Mihai Popa
Mathematics , 2009,
Abstract: The paper gives an operator algebras model for the conditional monotone independence, introduced by T. Hasebe. The construction is used to prove an embedding result for the N. Muraki's monotone product of C*-algebras. Also, the formulas from the definition of conditional monotone independence are used to define the monotone product of maps which is shown to preserve complete positivity, a similar to the results from the case of free products.
A Non-commutative analogue of Gaussian Hilbert Spaces
Mihai Popa
Mathematics , 2005,
Abstract: The paper gives analogues of some starting results in the theory of Gaussian Hilbert Spaces for semicircular distributed random variables. The transition from the commutative to the free frame is done considering matrices of increasing dimension and utilizing the Amitzur-Levitzki Theorem.
Audit Characteristics for Information System Security
Marius POPA,Mihai DOINEA
Informatica Economica Journal , 2007,
Abstract: The paper presents the main aspects regarding the development of the information security and assurance of their security. The information systems, standards and audit processes definitions are offered. There are presented the most important security standards used in information system security assessment
Non-Commutative Functions and Non-Commutative Free Levy-Hincin Formula
Mihai Popa,Victor Vinnikov
Mathematics , 2010,
Abstract: The paper is discussing infinite divisibility in the setting of operator-valued boolean, free and, more general, c-free independences. Particularly, using Hilbert bimodules and non-commutative functions techniques, we obtain analogues of the Levy-Hincin integral representation for infinitely divisible real measures.
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