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This book provides a basic introduction to reduced basis (RB) methods for problems involving the repeated solution of partial differential equations (PDEs) arising from engineering and applied sciences, such as PDEs depending on several parameters and PDE-constrained optimization. The book presents a general mathematical formulation of RB methods, analyzes their fundamental theoretical properties, discusses the related algorithmic and implementation aspects, and highlights their built-in algebraic and geometric structures. More specifically, the authors discuss alternative strategies for constructing accurate RB spaces using greedy algorithms and proper orthogonal decomposition techniques, investigate their approximation properties and analyze offline-online decomposition strategies aimed at the reduction of computational complexity. Furthermore, they carry out both a priori and a posteriori error analysis. The whole mathematical presentation is made more stimulating by the use of representative examples of applicative interest in the context of both linear and nonlinear PDEs. Moreover, the inclusion of many pseudocodes allows the reader to easily implement the algorithms illustrated throughout the text. The book will be ideal for upper undergraduate students and, more generally, people interested in scientific computing.

Differential equations, Partial --- Calculus --- Mathematics --- Physical Sciences & Mathematics --- Partial differential equations --- Differential equations, partial. --- Engineering mathematics. --- Hydraulic engineering. --- Partial Differential Equations. --- Mathematical Modeling and Industrial Mathematics. --- Mathematical and Computational Engineering. --- Engineering Fluid Dynamics. --- Engineering, Hydraulic --- Engineering --- Fluid mechanics --- Hydraulics --- Shore protection --- Engineering analysis --- Mathematical analysis --- Partial differential equations. --- Mathematical models. --- Applied mathematics. --- Fluid mechanics. --- Hydromechanics --- Continuum mechanics --- Models, Mathematical --- Simulation methods --- Differential equations, Partial.