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This Brief puts together two subjects, quantum and variational calculi by considering variational problems involving Hahn quantum operators. The main advantage of its results is that they are able to deal with nondifferentiable (even discontinuous) functions, which are important in applications. Possible applications in economics are discussed. Economists model time as continuous or discrete. Although individual economic decisions are generally made at discrete time intervals, they may well be less than perfectly synchronized in ways discrete models postulate. On the other hand, the usual assumption that economic activity takes place continuously, is nothing else than a convenient abstraction that in many applications is far from reality. The Hahn quantum calculus helps to bridge the gap between the two families of models: continuous and discrete. Quantum Variational Calculus is self-contained and unified in presentation. It provides an opportunity for an introduction to the quantum calculus of variations for experienced researchers but may be used as an advanced textbook by graduate students and even ambitious undergraduates as well. The explanations in the book are detailed to capture the interest of the curious reader, and complete to provide the necessary background material needed to go further into the subject and explore the rich research literature, motivating further research activity in the area.

Mathematics. --- Mathematical optimization. --- Quantum theory. --- Economics, Mathematical. --- Economics --- Mathematical economics --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Optimization (Mathematics) --- Optimization techniques --- Optimization theory --- Systems optimization --- Math --- Mathematics --- Calculus of variations. --- Quantum physics. --- Control engineering. --- Economic theory. --- Calculus of Variations and Optimal Control; Optimization. --- Control. --- Economic Theory/Quantitative Economics/Mathematical Methods. --- Quantum Physics. --- Science --- Economic theory --- Political economy --- Social sciences --- Economic man --- Control engineering --- Control equipment --- Control theory --- Engineering instruments --- Automation --- Programmable controllers --- Physics --- Mechanics --- Thermodynamics --- Isoperimetrical problems --- Variations, Calculus of --- Maxima and minima --- Econometrics --- Mathematical analysis --- Operations research --- Simulation methods --- System analysis --- Methodology --- Control and Systems Theory. --- Variational principles.