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Journal articles on the topic 'Quasi concave functions'

Author: Grafiati

Published: 10 March 2023

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1

Kempner, Yulia, and Ilya Muchnik. "Quasi-concave functions on meet-semilattices." Discrete Applied Mathematics 156, no. 4 (2008): 492–99. http://dx.doi.org/10.1016/j.dam.2006.12.005.

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2

Fabella, Raul V. "Quasi-Concave (Composition) Functions with Nonconcave Argument Functions." International Economic Review 33, no. 2 (1992): 473. http://dx.doi.org/10.2307/2526905.

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3

Kempner, Yulia, and Vadim E. Levit. "Duality between quasi-concave functions and monotone linkage functions." Discrete Mathematics 310, no. 22 (2010): 3211–18. http://dx.doi.org/10.1016/j.disc.2009.09.001.

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4

Colesanti, Andrea, Nico Lombardi, and Lukas Parapatits. "Translation invariant valuations on quasi-concave functions." Studia Mathematica 243, no. 1 (2018): 79–99. http://dx.doi.org/10.4064/sm170323-7-7.

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5

Richard, Scott F., and William R. Zame. "Proper preferences and quasi-concave utility functions." Journal of Mathematical Economics 15, no. 3 (1986): 231–47. http://dx.doi.org/10.1016/0304-4068(86)90012-1.

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6

Kempner, Y., B. Mirkin, and I. Muchnik. "Monotone linkage clustering and quasi-concave set functions." Applied Mathematics Letters 10, no. 4 (1997): 19–24. http://dx.doi.org/10.1016/s0893-9659(97)00053-0.

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7

Beer, Gerald. "Quasi-concave functions and convex convergence to infinity." Bulletin of the Australian Mathematical Society 60, no. 1 (1999): 81–94. http://dx.doi.org/10.1017/s0004972700033359.

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By a convex mode of convergence to infinity 〈Ck〉, we mean a sequence of nonempty closed convex subsets of a normed linear space X such that for each k, Ck+1 ⊆ int Ck and and a sequence 〈xn〉 is X is declared convergent to infinity with respect to 〈Ck〉 provided each Ck contains xn eventually. Positive convergence to infinity with respect to a pointed cone with nonempty interior as well as convergence to infinity in a fixed direction fit within this framework. In this paper we study the representation of convex modes of convergence to infinity by quasi-concave functions and associated remetrizati

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8

Anello, Giovanni, Maria B. Donato, and Monica Milasi. "Variational methods for equilibrium problems involving quasi-concave utility functions." Optimization and Engineering 13, no. 2 (2011): 169–79. http://dx.doi.org/10.1007/s11081-011-9151-5.

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9

Fowler, John W., Esma S. Gel, Murat M. Köksalan, Pekka Korhonen, Jon L. Marquis, and Jyrki Wallenius. "Interactive evolutionary multi-objective optimization for quasi-concave preference functions." European Journal of Operational Research 206, no. 2 (2010): 417–25. http://dx.doi.org/10.1016/j.ejor.2010.02.027.

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10

Bobkov, S. G., A. Colesanti, and I. Fragalà. "Quermassintegrals of quasi-concave functions and generalized Prékopa–Leindler inequalities." Manuscripta Mathematica 143, no. 1-2 (2013): 131–69. http://dx.doi.org/10.1007/s00229-013-0619-9.

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11

Asadujjaman, M., and M. Babul Hasan. "A Proposed Technique for Solving Quasi-Concave Quadratic Programming Problems with Bounded Variables." Dhaka University Journal of Science 63, no. 2 (2015): 111–17. http://dx.doi.org/10.3329/dujs.v63i2.24445.

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In this paper, a new method is proposed for finding an optimal solution to a Quasi-Concave Quadratic Programming Problem with Bounded Variables in which the objective function involves the product of two indefinite factorized linear functions and constraints functions are in the form of linear inequalities. The proposed method is mainly based upon the primal dual simplex method. The Linear Programming with Bounded Variables (LPBV) algorithm is extended to solve quasi-concave Quadratic Programming with Bounded Variables (QPBV). For developing this method, we use programming language MATHEMATICA

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12

Mastyło, Mieczysław. "Isomorphisms on interpolation spaces generated by the method of means." Annales Fennici Mathematici 47, no. 2 (2022): 1159–75. http://dx.doi.org/10.54330/afm.121842.

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We investigate the stability of isomorphisms acting between interpolation spaces generated by the method of means. We focus on the methods which are determined by balanced sequences for non-degenerate quasi-concave functions. The key point for our investigation is that these methods have orbital description by a single element generated by a special ideal of operators between Banach couples. We prove that if an operator is invertible in one orbit it is also invertible by nearby orbits provided that the corresponding indices of quasi-concave functions generated these orbits are close to each ot

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13

Persson, L. E., G. E. Shambilova, and V. D. Stepanov. "Hardy-type inequalities on the weighted cones of quasi-concave functions." Banach Journal of Mathematical Analysis 9, no. 2 (2015): 21–34. http://dx.doi.org/10.15352/bjma/09-2-3.

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14

T. E (Mrs), Efor,, and U. A. Osisiogu. "Characterization of Quasi-Concave Functions and Its Optimality Conditions In N." IOSR Journal of Mathematics 10, no. 4 (2014): 44–53. http://dx.doi.org/10.9790/5728-10434453.

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15

Persson, Lars-Erik, O. V. Popova, and Vladimir D. Stepanov. "Weighted Hardy-type inequalities on the cone of quasi-concave functions." Mathematical Inequalities & Applications, no. 3 (2014): 879–98. http://dx.doi.org/10.7153/mia-17-64.

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16

Korhonen, Pekka, Majid Soleimani-damaneh, and Jyrki Wallenius. "The use of quasi-concave value functions in MCDM: some theoretical results." Mathematical Methods of Operations Research 86, no. 2 (2017): 367–75. http://dx.doi.org/10.1007/s00186-017-0601-5.

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17

Henrion, René, and Werner Römisch. "Lipschitz and differentiability properties of quasi-concave and singular normal distribution functions." Annals of Operations Research 177, no. 1 (2009): 115–25. http://dx.doi.org/10.1007/s10479-009-0598-0.

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18

Jenkins, Porter, Ahmad Farag, J. Stockton Jenkins, Huaxiu Yao, Suhang Wang, and Zhenhui Li. "Neural Utility Functions." Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 9 (2021): 7917–25. http://dx.doi.org/10.1609/aaai.v35i9.16966.

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Current neural network architectures have no mechanism for explicitly reasoning about item trade-offs. Such trade-offs are important for popular tasks such as recommendation. The main idea of this work is to give neural networks inductive biases that are inspired by economic theories. To this end, we propose Neural Utility Functions, which directly optimize the gradients of a neural network so that they are more consistent with utility theory, a mathematical framework for modeling choice among items. We demonstrate that Neural Utility Functions can recover theoretical item relationships better

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19

Mirzadeh, S., and H. Mohebi. "Global minimization of the difference of increasing co-radiant and quasi-concave functions." Optimization Letters 12, no. 4 (2017): 885–902. http://dx.doi.org/10.1007/s11590-017-1155-4.

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20

Wang, Changsheng, Yang Wang, Caixia Yang, Xiangkui Zhang, and Ping Hu. "8-node and 12-node plane elements based on assumed stress quasi-conforming method immune to distorted mesh." Engineering Computations 34, no. 8 (2017): 2731–51. http://dx.doi.org/10.1108/ec-11-2016-0404.

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Purpose Severe accuracy loss may occur when finite element comes to the distorted mesh model, and the calculation may fail when element mesh degenerates into concave quadrangle or the element boundary is curved. This is a valuable research topic, and many efforts have been made to develop new finite element models. This paper aims to propose two quasi-conforming membrane elements based on the assumed stress quasi-conforming method and fundamental analytical solutions to overcome the difficulties. Design/methodology/approach First, the fundamental analytical solutions which satisfied both the e

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21

Xu, Quanhua. "Analytic functions with values in lattices and symmetric spaces of measurable operators." Mathematical Proceedings of the Cambridge Philosophical Society 109, no. 3 (1991): 541–63. http://dx.doi.org/10.1017/s030500410006998x.

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AbstractLet 0 < p,pi ≤ ∞, 0 < q,qi < ∞ (i = 1, 2) such thatLet E be a quasi-Banach lattice which fails to contain c0 and whose α-convexity constant is equal to 1 for some 0 < α < ∞. Then for every f∈H(E(q)) there exist g∈Hp, 0(E(q0)), h∈Hp1(E(q1)) such thatConsequently, E is q-concave for some finite q if and only if E is uniformly H1-convexifiable in the sense of [24]. Analogous results are also obtained for symmetric spaces of measurable operators. Another result proved in the paper says that if E is a symmetric quasi-Banach function space on (0, ∞) having the analytic Radon–N

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22

Benedetti, I., M. B. Donato, and M. Milasi. "Existence for Competitive Equilibrium by Means of Generalized Quasivariational Inequalities." Abstract and Applied Analysis 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/648986.

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A competitive economic equilibrium model integrated with exchange, consumption, and production is considered. Our goal is to give an existence result when the utility functions are concave, proper, and upper semicontinuous. To this aim we are able to characterize the equilibrium by means of a suitable generalized quasi-variational inequality; then we give the existence of equilibrium by using the variational approach.

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23

Stepanov, V. D. "On optimal Banach spaces containing a weighted cone of monotone or quasi-concave functions." Doklady Mathematics 92, no. 2 (2015): 545–47. http://dx.doi.org/10.1134/s1064562415050105.

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24

Asadujjaman, M., and M. Babul Hasan. "A Proposed Technique for Solving Quasi-Concave Quadratic Programming Problems with Bounded Variables by Objective Separable Method." Dhaka University Journal of Science 64, no. 1 (2016): 51–58. http://dx.doi.org/10.3329/dujs.v64i1.28524.

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In this paper, a new method namely, objective separable method based on Linear Programming with Bounded Variables Algorithm is proposed for finding an optimal solution to a Quasi-Concave Quadratic Programming Problems with Bounded Variables in which the objective function involves the product of two indefinite factorized linear functions and the constraint functions are in the form of linear inequalities. For developing this method, we use programming language MATHEMATICA. We also illustrate numerical examples to demonstrate our method.Dhaka Univ. J. Sci. 64(1): 51-58, 2016 (January)

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25

Tangian, Andranik S. "A Model for Constructing Monotonic and/or Quasi-Concave Quadratic Objective Functions from Ordinal Data." IFAC Proceedings Volumes 32, no. 2 (1999): 6200–6205. http://dx.doi.org/10.1016/s1474-6670(17)57059-7.

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26

Mirzadeh, S., and H. Mohebi. "Abstract Concavity of Increasing Co-radiant and Quasi-Concave Functions with Applications in Mathematical Economics." Journal of Optimization Theory and Applications 169, no. 2 (2016): 443–72. http://dx.doi.org/10.1007/s10957-016-0901-6.

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27

Sbert, Mateu, Jordi Poch, Shuning Chen, and Víctor Elvira. "Stochastic Order and Generalized Weighted Mean Invariance." Entropy 23, no. 6 (2021): 662. http://dx.doi.org/10.3390/e23060662.

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In this paper, we present order invariance theoretical results for weighted quasi-arithmetic means of a monotonic series of numbers. The quasi-arithmetic mean, or Kolmogorov–Nagumo mean, generalizes the classical mean and appears in many disciplines, from information theory to physics, from economics to traffic flow. Stochastic orders are defined on weights (or equivalently, discrete probability distributions). They were introduced to study risk in economics and decision theory, and recently have found utility in Monte Carlo techniques and in image processing. We show in this paper that, if tw

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28

Satoh, Atsuhiro, and Yasuhito Tanaka. "Two Person Zero-Sum Game with Two Sets of Strategic Variables." International Game Theory Review 21, no. 03 (2019): 1850014. http://dx.doi.org/10.1142/s0219198918500147.

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We consider a two-person zero-sum game with two sets of strategic variables which are related by invertible functions. They are denoted by [Formula: see text] and [Formula: see text] for players A and B. The payoff function of Player A is [Formula: see text]. Then, the payoff function of Player B is [Formula: see text]. [Formula: see text] is upper semi-continuous and quasi-concave on [Formula: see text] for each [Formula: see text] (or each [Formula: see text]), upper semi-continuous and quasi-concave on [Formula: see text] for each [Formula: see text] (or each [Formula: see text]), lower sem

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29

Goyal, Vineet, and R. Ravi. "An FPTAS for minimizing a class of low-rank quasi-concave functions over a convex set." Operations Research Letters 41, no. 2 (2013): 191–96. http://dx.doi.org/10.1016/j.orl.2013.01.004.

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30

Malakooti, B. "Ranking multiple criteria alternatives with half-space, convex, and non-convex dominating cones: quasi-concave and quasi-convex multiple attribute utility functions." Computers & Operations Research 16, no. 2 (1989): 117–27. http://dx.doi.org/10.1016/0305-0548(89)90014-2.

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31

Malakooti, Behnam. "Double Helix Value Functions, Ordinal/Cardinal Approach, Additive Utility Functions, Multiple Criteria, Decision Paradigm, Process, and Types (Z Theory I)." International Journal of Information Technology & Decision Making 14, no. 06 (2015): 1353–400. http://dx.doi.org/10.1142/s0219622014500412.

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Z Utility Theory refers to a class of nonlinear utility functions for solving Risk and Multiple Criteria Decision-Making problems. Z utility functions are hybrids of additive and nonadditive (nonlinear) functions. This paper addresses the concepts and assessment methods for the additive part of Z-utility functions for multiple criteria problems that satisfy the efficiency (nondominancy) principle. We provide a decision paradigm and guidelines on how to approach, formulate, and solve decision-making problems. We, also, overview the modeling of decision process based on four types of decision-ma

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32

Deligkas, Argyrios, John Fearnley, and Paul Spirakis. "Lipschitz Continuity and Approximate Equilibria." Algorithmica 82, no. 10 (2020): 2927–54. http://dx.doi.org/10.1007/s00453-020-00709-3.

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Abstract In this paper, we study games with continuous action spaces and non-linear payoff functions. Our key insight is that Lipschitz continuity of the payoff function allows us to provide algorithms for finding approximate equilibria in these games. We begin by studying Lipschitz games, which encompass, for example, all concave games with Lipschitz continuous payoff functions. We provide an efficient algorithm for computing approximate equilibria in these games. Then we turn our attention to penalty games, which encompass biased games and games in which players take risk into account. Here

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33

Malakooti, B. "An exact interactive method for exploring the efficient facets of multiple objective linear programming problems with quasi-concave utility functions." IEEE Transactions on Systems, Man, and Cybernetics 18, no. 5 (1988): 787–801. http://dx.doi.org/10.1109/21.21604.

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34

Ullah, Hidayat, Muhammad Adil Khan, and Tareq Saeed. "Determination of Bounds for the Jensen Gap and Its Applications." Mathematics 9, no. 23 (2021): 3132. http://dx.doi.org/10.3390/math9233132.

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The Jensen inequality has been reported as one of the most consequential inequalities that has a lot of applications in diverse fields of science. For this reason, the Jensen inequality has become one of the most discussed developmental inequalities in the current literature on mathematical inequalities. The main intention of this article is to find some novel bounds for the Jensen difference while using some classes of twice differentiable convex functions. We obtain the proposed bounds by utilizing the power mean and Höilder inequalities, the notion of convexity and the prominent Jensen ineq

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35

Choi, SungYong, KyungBae Park, and and Sang-Oh Shim. "The Optimal Emission Decisions of Sustainable Production with Innovative Baseline Credit Regulations." Sustainability 11, no. 6 (2019): 1635. http://dx.doi.org/10.3390/su11061635.

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In the era of the fourth industrial revolution, the international community is striving to establish a coordinated system to prevent fatal climate change in a global sense. As a result of such changes in business environments, a new issue, sustainability, has recently presented a paradigm shift and new research opportunity in which the theories and practices in traditional production and operations management are being reinterpreted and reapplied in relation to this emerging issue. Under this research background, we consider an optimal emission-trading problem under a cap-and-trade (CAT) emiss

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36

"Differential characterization of quasi-concave functions without twice differentiability." Communications in Optimization Theory 2022 (2022). http://dx.doi.org/10.23952/cot.2022.21.

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37

Itaya, Jun-ichi, and Pierre von Mouche. "Equilibrium uniqueness in aggregative games: very practical conditions." Optimization Letters, July 20, 2021. http://dx.doi.org/10.1007/s11590-021-01780-7.

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AbstractVarious Nash equilibrium results for a broad class of aggregative games are presented. The main ones concern equilibrium uniqueness. The setting presupposes that each player has $$\mathbb {R}_+$$ R + as strategy set, makes smoothness assumptions but allows for a discontinuity of stand-alone payoff functions at 0; this possibility is especially important for various contest and oligopolistic games. Conditions are completely in terms of marginal reductions which may be considered as primitives of the game. For many games in the literature they can easily be checked. They automatically im

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38

Apel, Thomas, and Volker Kempf. "Pressure-robust error estimate of optimal order for the Stokes equations: domains with re-entrant edges and anisotropic mesh grading." Calcolo 58, no. 2 (2021). http://dx.doi.org/10.1007/s10092-021-00402-z.

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AbstractThe velocity solution of the incompressible Stokes equations is not affected by changes of the right hand side data in form of gradient fields. Most mixed methods do not replicate this property in the discrete formulation due to a relaxation of the divergence constraint which means that they are not pressure-robust. A recent reconstruction approach for classical methods recovers this invariance property for the discrete solution, by mapping discretely divergence-free test functions to exactly divergence-free functions in the sense of $${\varvec{H}}({\text {div}})$$ H ( div ) . Moreover

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39

Guerra, Juan M., Carsten Mahr, Marcel Giar, Michael Czerner, and Christian Heiliger. "Ab initio calculations of conduction band effective mass parameters of thermoelectric $${\hbox {Mg}}_{2} {\hbox {X}}_{1{-}x} {\hbox {Y}}_x$$ (X, Y = Si, Ge, Sn) alloys." Scientific Reports 10, no. 1 (2020). http://dx.doi.org/10.1038/s41598-020-73277-9.

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Abstract Since there are still research interests in the physical properties of quasi-binary thermoelectric $${\hbox {Mg}}_{2} {\hbox {X}}_{1-x}{\hbox {Y}}_{x}$$ Mg 2 X 1 - x Y x alloys, with X, Y = Si, Ge, Sn, we present an ab initio analysis that yields the relative formation energy and effective masses of the conduction bands, in the whole compositional range x. We base our calculations on the full-relativistic Korringa, Kohn and Rostocker (KKR) Green’s functions formalism within the coherent potential approximation (CPA). Formation energies, measured relative to the end $${\hbox {Mg}}_{2}

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40

Belardinelli, Sergio. "Il bene famiglia e le sue funzioni sociali. The Good-Family and its Social Functions." Metafísica y persona, no. 6 (May 30, 2017). http://dx.doi.org/10.24310/metyper.2011.v0i6.2785.

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In una società dove, da più parti, la famiglia è sotto attacco, occorre creare una cultura della famiglia che sia anche per la famiglia. La tendenza a identificare con la famiglia qualsiasi aggregazione di individui, a prescindere dal sesso o dal vincolo che li tiene uniti, produce uno scossone semantico destinato a danneggiare non soltanto la famiglia ma l’intera società. Nonostante i cambiamenti che abbiamo registrato in questi ultimi anni, la famiglia tradizionale continua a essere l’istituzione sociale che più di altre incide sulla formazione delle persone e che più di altre è capace di ge

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41

Dodd, Adam. "The Fortean Continuity of eXistenZ within a Virtual Environment." M/C Journal 3, no. 5 (2000). http://dx.doi.org/10.5204/mcj.1871.

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So then: That all phenomena in our intermediate state, or quasi-state, represent this one attempt to organise, stabilise, harmonise, individualise -- or to positivise, or to become real: That only to have seeming is to express failure or intermediateness to final failure and final success; That every attempt -- that is observable -- is defeated by Continuity, or by outside forces -- or by the excluded that are continuous with the included: That our whole "existence" is an attempt by the relative to be absolute, or by the local to be the universal. -- Charles Fort, The Book of the Damned (1919)

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42

Banks, John. "From Fetish to Factish and Back Again." M/C Journal 2, no. 5 (1999). http://dx.doi.org/10.5204/mcj.1769.

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Introduction This essay is very much an anxious response to an earlier article, "Controlling Gameplay", that I wrote for M/C about gameplay: the immersive, visceral experience of playing computer and video games. I argued that gameplay concerns the event status of playing computer and video games, and that as such it exceeds the symbolic content of games. Now, I continue to be troubled by the implications of this assertion -- does it not give up too much ground gained by the understanding that social practices such as gaming are socially constructed? Does it not return us to all of the problem

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