# Department of Mathematics, Corvinus University of Budapest

# Pure Mathematics and Applications

Postal: 1093 Budapest, Fővám tér 8

Phone: +36-1-482-5347

Web page: http://economics.uni-corvinus.hu/

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Phone: +36-1-482-5347

Web page: http://economics.uni-corvinus.hu/

Email:

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### 2005, Volume 16, Issue 3

**191-197 On finding the generalized inverse matrix for the product of matrices***by*Ren, X.M., Wang, Y. & Shum, K.P.**199-216 An algorithmic approach to maximal unions of chains in a partially ordered set***by*Barnabei, M., Bonetti, F. & Silimbani, M.**217-227 Perfect wrpp semigroups***by*Chen, Y.Z. & Li, Y.**229-250 Catalan-like numbers and succession rules***by*Ferrari, L. & Pinzani, R.**251-265 On a tomographic equivalence between $(0,1)$ matrices***by*Frosini, A. & Nivat, M.**267-286 The structure and labelled enumeration of $K\sb 3,3$-subdivision-free projective-planar graphs***by*Gagarin, A., Labelle, G. & Leroux, P.**287-293 Two new characterizations for sporadic simple groups***by*Khosravi, A. & Khosravi, B.**295-305 A variant of the guessing secrets game***by*Louchard, G., Marini, C., Montagna, F. & Simi, G.**307-314 Regular elements of some transformation semigroups***by*Nenthein, S., Youngkhong, P. & Kemprasit, Y.

### 2005, Volume 16, Issue 1-2

**1-13 The proper $sm$-representations of finite groups and other research problems***by*Migliorini, F.**15-18 Some Tuscan scholars of algebraic geometry***by*Zappa, G.**19-30 Subgroups closed under permutability and $Z$-partitions in finite groups***by*Tibiletti, C.M.**31-35 Professor JenÅ‘ SzÃ©p as an educator and game theorist***by*ForgÃ³, F.**37-42 Principal filters of po-semigroups***by*Ren, X.M., Yan, J.Z. & Shum, K.P.**43-54 Some lower bounds for status in finite semigroups***by*Piochi, B. & Rodaro, E.**55-68 Idempotent-separating homomorphic images of weakly inverse semigroups***by*Yu, B. & Xu, M.**69-80 Some remarks on tiling recognizable languages***by*De Carli, F., Frosini, A., Rinaldi, S. & Sorbi, A.**81-88 Regular semigroups with inverse transversals***by*Zhu, F.**89-102 From lattice ordered abelian groups to the algebras of many-valued logic: a survey***by*Montagna, F.**103-106 JenÅ‘ SzÃ©p and nearrings***by*Ferrero, G.**107-109 History of the concept of group***by*Toti Rigatelli, L.**111-117 A new description of completely Archimedean semigroup***by*Zhou, S.**119-123 Some algebraic remarks on circular codes***by*Pirillo, G.**125-144 Solvable rings***by*Catino, F., Miccoli, M.M. & Spinelli, E.**145-149 A note on the Artinian condition of cohomology modules***by*Chu, L.Z.**151-158 The Fano plane and a particular type of Lie algebras***by*Lenzi, D.**159-163 The nilpotent length of solvable linear groups and solvable permutation groups***by*Zhang, G.**165-171 Monoids characterized by condition $(E')$***by*Qiao, H. & Liu, Z.**175-189 Bibliography of JenÅ‘ SzÃ©p***by*0**iii-v JenÅ‘ SzÃ©p and his scientific activity in Italy***by*Migliorini, F.

### 2004, Volume 15, Issue 4

**357-374 Demographic dynamics for the pay-as-you-go pension system***by*Angrisani, M., Attias, A., Bianchi, S. & Varga, Z.**375-381 Concept of strongly normal spaces---a subclass of $N$-scattered spaces***by*Chattopadhyay, C.**383-392 The maximum and minimum number of circuits and bases of matroids***by*DÃ³sa, G., Szalkai, I. & Laflamme, C.**393-408 On some constraint qualification conditions in set-valued optimization***by*Durea, M.**409-418 Stable outcomes for contract choice problems***by*Lahiri, S.**419-427 $M/G/1$ queue with multiple vacations and server set-up and close-down times***by*Ma, Z., Tian, N. & Liu, M.**429-438 Optimal Haar wavelets on spherical triangulations***by*RoÅŸca, D.**439-451 Distributed control for cooperative systems involving parabolic operators with an infinite number of variables***by*Serag, H.M.**453-468 On stable learning in dynamic oligopolies***by*Szidarovszky, F. & Krawczyk, J.B.**469-486 On a closedness theorem***by*UjvÃ¡ri, M.**487-495 The maximum likelihood function method to derive the priority vector of the comparison matrix on the double scale***by*Wei, C. & Zhang, Y.

### 2004, Volume 15, Issue 2-3

**87-106 A class of double subordination-preserving integral operators***by*BulboacÄƒ, T.**107-112 Quantitative estimates on approximation by an integral type operator***by*Ciupa, A.**113-126 A new approach for optimal fragmentation order in distributed object oriented databases***by*Darabant, A.S. & Campan, A.**127-133 On a Darboux-type problem for a third order hyperbolic equation***by*DezsÅ‘, G.**135-147 On the acceleration of the convergence of certain iterative methods using a proceeding Traub's type***by*Diaconu, A.**149-156 The Hausdorff operator on the dyadic field***by*Eisner, T.**343-348 On exponentially coprime integers***by*TÃ³th, L.**349-356 A generalized student optimal control problem***by*Vornicescu, N.

### 2004, Volume 15, Issue 1

**1-15 A mathematical model for the management of an invalidity old age survivor pension fund: the exact individual trajectories method***by*Angrisani, M. & Attias, A.**17-27 Common fixed point theorems under contractive conditions of Skof type***by*Ahmed, M.A.**29-43 Impulsive viable problems monitored by differential inclusions with almost lower semicontinuous multifunctions***by*Cardinali, T. & Notarpietro, R.**45-54 Some notes on a dynamic model of international fishing***by*Hall, A.D., Szidarovszky, F. & Zhao, J.**55-62 The Fenchel-Young duality and the best approximation problem***by*NÃ©meth, A.B.**63-72 Movement of equilibrium of Cournot duopoly and the visualization of bifurcations of its adjustment dynamics***by*Sonis, M. & Dridi, C.**73-86 Solving general nonlinear programming problems via trust region and conjugate gradient methods***by*Yu, Z., Ni, J. & Liu, J.

### 2003, Volume 14, Issue 4

**275-288 Fuzzy grade of i.p.s.\ hypergroups of order less than or equal to 6***by*Corsini, P. & Cristea, I.**289-303 Semigroups with negative natural partial order***by*Maia, A.F. & Mitsch, H.**305-311 On the finite join spaces associated with rough sets***by*Moghani, G.A., Ashrafi, A.R. & Davvaz, B.**313-319 Uniform topology on hyper $K$-algebras***by*Borumand Saeid, A. & Zahedi, M.M.**321-327 Join spaces, hypervector spaces and generalized permutations***by*Yavari, M.**329-346 Dual positive implicative hyper $K$-ideals of type 2***by*Zahedi, M.M., Torkzadeh, L. & Borzooei, R.A.**347-354 The dimension of orbital subspace***by*Zamani, Y.**355-361 Congruences on semirings which are the disjoint unions of rings***by*Zhou, Y.L.**363-368 On the $sm$-representation of finite groups***by*Migliorini, F. & SzÃ©p, J.

### 2003, Volume 14, Issue 3

**161-171 Existence theorems for periodic semilinear impulsive problems (viable and not viable cases)***by*Cardinali, T. & Servadei, R.**173-180 On error bounds for vector valued functions***by*Durea, M.**181-197 Stabilization of sampled-data nonlinear systems by an $l$-step receding horizon control based on their approximate discrete-time models***by*Elaiw, A.M.**199-206 A heuristic method for the asymmetric Hamiltonian $p$-median problem***by*Imreh, B. & Imreh, S.**207-220 Axiomatic characterization of the Nash and Kalai-Smorodinsky solutions for discrete bargaining problems***by*Lahiri, S.**221-232 Development of robust fuzzy regression techniques using a fuzzy clustering approach***by*Pop, H.F.**233-248 A new algorithm for the solution of $N$-person prisoners' dilemmas with Pavlovian agents***by*SzilÃ¡gyi, M.N., Zhao, J. & Szidarovszky, F.**249-261 The analysis of a continuous time queueing model with single vacation and set-up time***by*Wei, C., Xia, Z. & Tian, N.**263-274 Optimality and mixed duality for nonsmooth multi-objective fractional programming***by*Zhou, H. & Wang, Y.

### 2003, Volume 14, Issue 1-2

**1-13 Some classifications of fuzzy positive implicative hyper $K$-ideals***by*Borzooei, R.A. & Zahedi, M.M.**15-19 Fuzzy fundamental groups***by*Davvaz, B.**21-33 On the enumeration of pseudo-parallelogram polyominoes***by*Frosini, A., Mirolli, M. & Rinaldi, S.**35-50 Naturally ordered abundant semigroups with adequate transversals***by*Gao, Z.**51-55 $n$-independent subsets of $n$-dimensional vector spaces***by*Guo, Y.Q. & Shum, K.P.**57-67 The adjoint semigroup of a ring***by*Heatherly, H.E., Lewallen, J.A. & Tucci, R.P.**69-77 Homology of relational hypergroups***by*Hosseini, S.N.**79-85 On the concept of a group and its axiomatizations***by*Lenzi, D.**87-92 On the maximal subgroups of Sylow subgroups of the generalized Fitting subgroup of finite groups***by*Li, Y.**93-104 Locally regular $\ast$-semigroups and regular semigroups with a quasi-ideal regular $\ast$-transversal***by*Li, Y.**105-116 Lattices on Grand-Motzkin paths***by*Marini, C. & Marzuoli, P.**117-120 Generalized dynamical systems***by*Molaei, M.R.**121-140 Category of topological polygroup objects***by*Mousavi, S.S., Zahedi, M.M. & Hosseini, S.N.**141-144 Inequalities characterizing standard Sturmian words***by*Pirillo, G.**145-150 Some relations of Abel-Grassmann's 3-bands***by*StevanoviÄ‡, N. & ProtiÄ‡, P.V.**151-153 On the $C$-decomposition of groups***by*SzÃ©p, J.**155-160 Notes on subdirect products of semirings and rectangular band semirings***by*Zhou, Y. & Guo, Y.Q.

### 2002, Volume 13, Issue 4

**423-431 A simple proof of the generalized Farkas lemma for oriented matroids***by*Balogh, L., IllÃ©s, T. & Erbilen, F.**433-440 Applications of the admissible functions method for some differential equations***by*Baricz, Ã.**441-445 On the relaxation theorem for semilinear differential inclusions in Banach spaces***by*Cernea, A.**447-453 Bounded weak solutions for differential equations in Banach spaces***by*Gomaa, A.M.**455-462 Existence of Nash-Cournot equilibrium in oligopoly games with pollution treatment cost-sharing***by*Okuguchi, K. & Szidarovszky, F.**463-471 Capture model in the restricted three-body problem***by*Szenkovits, F., MakÃ³, Z., Csillik, I. & BÃ¡lint, A.**473-481 The asymptotic behavior of producer-consumer markets***by*Szidarovszky, F. & Westberry-Kutz, T.**483-493 A new projection and contraction method for variational inequalities***by*Wang, Y.**495-508 Approximation to the subdifferential mappings of convex functions***by*Wang, M. & Xia, Z.

### 2002, Volume 13, Issue 3

**303-315 LR-inverse semigroup***by*Aihua, D. & Guo, Y.Q.**317-324 Minimal quasi-ideals of generalized rings of linear transformations***by*Chinram, R. & Kemprasit, Y.**325-331 Estimation of the number of twin primes by application of the complementary prime sieve***by*DÃ©nes, T.**333-341 Quasi-modules***by*Fazaeli, H. & Molaei, M.R.**343-357 Semigroups with trivial natural partial order***by*Maia, A.F. & Mitsch, H.**359-371 Constructions of trivially ordered semigroups***by*Maia, A.F. & Mitsch, H.**373-381 Weak mutually associative hyperstructures. I***by*Leoreanu, V.**383-387 Subdirectly irreducible strongly $\scr R\scr G\scr C\sb n$-commutative semigroups with a globally idempotent core***by*Nagy, A.**389-392 On commutative monoid congruences of semigroups***by*Nagy, A.**393-397 The generalized characteristic polynomial associated with a tree***by*Sehatkhah, M.**399-415 Jacobians of hyperelliptic curves for cryptography***by*Sonnino, A.**417-421 On the stability of closed systems***by*SzÃ©p, J. & Szidarovszky, P.F.

### 2002, Volume 13, Issue 1-2

**1-20 Algorithm for D-V cells and fundamental domains of $\Bbb E\sp d$ space groups (to decagonal and icosahedral families in $\Bbb E\sp 4$)***by*Ãcs, L. & MolnÃ¡r, E.**21-30 Fredholm-Volterra equations***by*AndrÃ¡s, S.**31-37 Finite words with special complexity properties***by*Anisiu, M.**39-48 Maximal complexity of finite words***by*Anisiu, M., BlÃ¡zsik, Z. & KÃ¡sa, Z.**49-62 Isolating the families of soliton graphs***by*Bartha, M. & KrÃ©sz, M.**63-77 Categories and algebraical structures for real fuzzy numbers***by*Bica, A.**79-85 Dominating sets in de Bruijn graphs***by*BlÃ¡zsik, Z. & KÃ¡sa, Z.**87-96 On a class of integral operators that preserve the subordination***by*BulboacÄƒ, T.**97-109 A new deficient spline functions collocation method for the second order delay differential equations***by*Calio, F., Marchetti, E., Pavani, R. & Micula, G.**111-116 On a class of modules having no maximal submodule***by*Crivei, I.**117-124 On a generalization of the Loewy series of a module***by*Crivei, S.**125-132 Purely functional programming and the object-oriented inheritance***by*CsÃ¶rnyei, Z., KovÃ¡cs, L. & LÃ©grÃ¡di, G.**133-158 Design and implementation of synchronisation patterns using an extension to UML: a case study***by*Frohner, Ã., Kozsik, T. & Varga, L.**159-169 A procedure based on automaton theory approach for solving modified PNS problems***by*HollÃ³, C.**171-183 Maximal tournaments***by*IvÃ¡nyi, A.**185-195 Viability results in control of one-dimensional discrete time dynamical systems defined by a multi-function***by*KovÃ¡cs, G., MureÅŸan, M. & VizvÃ¡ri, B.**197-210 Small universal Turing and circular Post machines***by*Kudlek, M. & Rogozhin, Y.**211-225 The gradient-Fourier method for nonlinear Neumann boundary value problems and its algorithmic realization in Mathematica***by*LÃ³czi, L.**227-237 Fisher's information measures for a truncated gamma distribution. II***by*Mihoc, I. & FÄƒtu, C.I.**239-245 Estimates of the norms of some generalized projections with applications to Lagrange interpolation***by*Mitrea, A.I.**247-251 A simple sufficient condition for starlikeness of order alpha***by*Mocanu, P.T. & Oros, G.**253-258 On a class of differential equations with linear modification of the argument***by*MureÅŸan, V.**259-274 Metrics based on neighbourhood sequences in triangular grids***by*Nagy, B.**275-281 Dynamic systems, fixed points and fractals***by*PetruÅŸel, A.**283-291 On the sharpness and generalizations of the Fine-Wilf periodicity theorem***by*Rudolf, G.**293-302 Comparison and usability of two rewriting systems for theorem proving***by*Varga, K.P. & VÃ¡rterÃ©sz, M.

### 2001, Volume 12, Issue 4

**337-353 On the finite semi-join spaces and fuzzy sets***by*Corsini, P. & Moghani, G.A.**355-363 On the connections between RSA cryptosystem and the Fibonacci numbers***by*DÃ©nes, J. & DÃ©nes, T.**365-382 On derivations of lattices***by*Ferrari, L.**383-388 Thierrin theorem in semigroups and its generalization***by*Guo, Y.Q., Wang, Z.P. & Shum, K.P.**389-403 Hypergroup objects***by*Hosseini, S.N., Khorashadi-Zadeh, M.R. & Zahedi, M.M.**405-413 On semigroups of linear transformations whose bi-ideals are quasi-ideals***by*Kemprasit, Y. & Namnak, C.**415-424 A characterization of $\sp 2D\sb 4(q)$***by*Khosravi, B.**425-429 Generalized local groups***by*Molaei, M.R. & Fazaeli, H.**431-436 Band decompositions of Abel-Grassmann's groupoids***by*StevanoviÄ‡, N. & ProtiÄ‡, P.V.**437-450 The dimensions of modular symmetry classes of tensors associated with the dicyclic groups***by*Zamani, Y. & Mehrvarz, A.A.

### 2001, Volume 12, Issue 3

**235-247 A study on the space of entire functions having finite growth***by*Abul-Ez, M.A.**249-253 Existence of a continuous certainty equivalent for a complete preorder on the space of upper-continuous capacities***by*Bosi, G.**255-264 Landesman-Lazer type conditions for quasilinear periodic differential equations***by*Cardinali, T., Papageorgiou, N.S. & Yannakakis, N.**265-286 Multiobjective optimization of a public supply wellfield using a computational neural network***by*Coppola, J. & Szidarovszky, F.**287-296 Generalized Multifit-type methods for scheduling parallel identical machines***by*DÃ³sa, G.**296-310 Fractional-order differential equations with memory and fractional-order relaxation-oscillation model***by*El-Sayed, A.M.A. & Gaafar, F.M.**311-317 A threshold value for a system with demographic fluctuations***by*GÃ¡mez, M., LÃ³pez, I. & CarreÃ±o, R.**319-325 An elementary proof of a result for polyhedral cones***by*Lahiri, S.**327-335 On a constrained PVT algorithm for constrained convex programming***by*Pang, L. & Xia, Z.

### 2001, Volume 12, Issue 2

**131-136 Anti fuzzy ideals of a Lie algebra***by*Davvaz, B.**137-145 $TL$-subpolygroups of a polygroup***by*Davvaz, B.**147-195 Some applications of non-associative algebraic systems in cryptology***by*DÃ©nes, J. & Keedwell, A.D.**197-207 Complementary prime-sieve***by*DÃ©nes, T.**209-218 $\scr L$-trivial semigroups***by*Mitsch, H.**219-234 On generalized polygroup objects***by*Zahedi, M.M., Mousavi, S.S. & Hosseini, S.N.

### 2001, Volume 12, Issue 1

**1-9 Combined relaxation method with Frank-Wolfe type auxiliary procedures for variational inequalities over product sets***by*Allevi, E., Gnudi, A. & Konnov, I.V.**11-23 On the non-autonomous logistic equation***by*CarreÃ±o, R., LÃ³pez, I. & GÃ¡mez, M.**25-50 Successive regression approximations for solving equations***by*DeÃ¡k, I.**51-65 Instant controllability for Goursat problems***by*Gyurkovics, Ã‰. & Jank, G.**67-77 On the attractivity of closed sets by feedback controls***by*Gabor, G. & Zoli, E.**79-94 Nonlinear elliptic equations with discontinuous nonlinearities***by*Kourogenis, N.C. & Papageorgiou, N.S.**95-106 Analysis of dynamic producer-consumer systems***by*Mendoza, D.B. & Szidarovszky, F.**107-118 Convexity and concavity of direct and indirect utility functions***by*SzabÃ³, I.**119-130 A note on the graph-bisection problem***by*UjvÃ¡ri, M.

### 2000, Volume 11, Issue 4

**543-551 Characterization of generalized groups of orders 2 and 3***by*Borzooei, R.A., Rezaei, G.R., Molaei, M.R. & Zahedi, M.M.**553-557 A note on Cayley-Hamilton theorem for generalized matrix function***by*Darafsheh, M.R., Mallahi, K. & Pournaki, M.R.**559-563 On Latin squares and a digital encrypting communication system***by*DÃ©nes, J.**565-570 On a problem of O. Ore***by*DÃ©nes, J. & SzÃ©p, J.**571-580 On finite strongly canonical hypergroups***by*Falcone, G.**581-591 Relative strongly graded Clifford systems***by*Hussain, S.E.D.S.**593-596 Generalized Ito's theorem on $p$-nilpotent groups***by*Lam, C., Shum, K.P. & Guo, W.**597-602 On intra-regular po-semigroups***by*Lee, S.K. & Kim, K.H.**603-614 A classification of two-generated finite groups in terms of $sm$-representability***by*Migliorini, F. & Rinaldi, S.**615-627 Modular symmetry classes of tensors associated with dihedral groups***by*Shahabi, M.A. & Zamani, Y.**629-637 A characterization of groups related to the linear groups $\rm PSL(n,2),\ n=5,6,7,8$***by*Darafsheh, M.R. & Moghaddamfar, A.R.**639-652 Some results on the category of $L\sb t$-fuzzy hypergraphs***by*Zahedi, M.M., Khorashadi-Zadeh, M.R. & Corsini, P.**653-706 Picard group, zeta functions and Riemann-Roch formula***by*Francini, P.

### 2000, Volume 11, Issue 3

**401-407 ECO-systems for Dyck and SchrÃ¶der paths***by*Barcucci, E., Pergola, E., Pinzani, R. & Rinaldi, S.**409-425 Approximate X-rays reconstruction of special lattice sets***by*Brunetti, S., Daurat, A. & Lungo, A.D.**427-431 Adjoint group of a ring***by*Catino, F.**433-438 A finiteness condition for $\scr R$-classes of amalgams of inverse semigroups***by*Cherubini, A. & Piochi, B.**439-446 Fuzzy sets, join spaces and factor spaces***by*Corsini, P.**447-456 Nearrings with given semigroup of dilatations***by*Ferrero, C.C.**457-469 Semigroups and minimality in nearrings***by*Ferrero, G.**471-484 The Garden of Eden theorem for sofic shifts***by*Fiorenzi, F.**485-496 The complexity of the reconstruction of $(r,h,v)$ from two projections and an approximation algorithm***by*Frosini, A. & Rinaldi, S.**497-508 About half the middle binomial coefficient***by*Frosini, A., Pinzani, R. & Rinaldi, S.**509-516 Direct limit and inverse limit of join spaces associated with fuzzy sets***by*Leoreanu, V.**517-519 Strongly Lie nilpotent rings***by*Miccoli, M.M.**521-532 Some topics and a classification in the theory of sm-representation of finite groups***by*Migliorini, F.**533-537 From the Fibonacci word to Sturmian words. II***by*Pirillo, G.**539-541 Lehmer's conjecture***by*Siciliano, S.