The contributions in this volume aim to deepenunderstanding of some of the current research problems and theories inmodern topics such as calculus of variations, optimization theory, complexanalysis, real analysis, differential equations, andgeometry. Applications to these areas of mathematics are presented withinthe broad spectrum of research in Engineering Science withparticular emphasis on equilibrium problems, complexity in numericaloptimization, dynamical systems, non-smooth optimization, complex networkanalysis, statistical models and data mining, and energy systems. Additionalemphasis is given to interdisciplinary research, although subjects are treatedin a unified and self-contained manner. The presentation of methods, theory andapplications makes this tribute an invaluable reference for teachers,researchers, and other professionals interested in pure and appliedresearch, philosophy of mathematics, and mathematics education. Somereview papers published in this volume will be particularly useful for abroader audience of readers as well as for graduate students who search for thelatest information.    ​