G. Isac Books

Stability of functional equations in several variables
Stability of functional equations in several variables

By Donald H. Hyers

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The notion of stability of functional equations has its origins with S. M. Ulam, who posed the fundamental problem in 1940 and with D. H. Hyers, who gave the first significant partial solution in 1...

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Topological Methods in Complementarity Theory
Topological Methods in Complementarity Theory

By George Isac

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Complementarity theory is a new domain in applied mathematics and is concerned with the study of complementarity problems. These problems represent a wide class of mathematical models related to op...

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Complementarity Equilibrium Efficiency and Economics
Complementarity Equilibrium Efficiency and Economics

By G. Isac

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In complementarity theory, which is a relatively new domain of applied mathematics, several kinds of mathematical models and problems related to the study of equilibrium are considered from the poi...

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Stability of Functional Equations in Several Variables
Stability of Functional Equations in Several Variables

By Donald H. Hyers

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The notion of stability of functional equations has been an area of revision and development for the past 20 years, having its origins more than half a century ago when S. Ulam posed the fundamenta...

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Topological Methods in Complementarity Theory
Topological Methods in Complementarity Theory

By George Isac

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Complementarity theory is a new domain in applied mathematics and is concerned with the study of complementarity problems. These problems represent a wide class of mathematical models related to op...

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Complementarity, Equilibrium, Efficiency and Economics
Complementarity, Equilibrium, Efficiency and Economics

By G. Isac

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In complementarity theory, which is a relatively new domain of applied mathematics, several kinds of mathematical models and problems related to the study of equilibrium are considered from the poi...

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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