This book is the first volume of a three-part textbook suitable for both graduate coursework and professional engineering and research reference alike. It is also appropriate for graduate flipped classes. Each volume is divided into short chapters that can be covered in one teaching unit and includes exercises as well as solutions available from a dedicated website. The structure allows for the salient ideas to be addressed during lecture, with the rest of the content assigned as reading material. To engage the reader, the text’s exposition combines motivating examples, basic ideas, rigorous proofs, and pointers to the literature to enhance scientific literacy.Volume I is divided into 23 chapters plus two appendices on Banach and Hilbert spaces and on differential calculus. This volume focuses on the fundamental ideas regarding the construction of finite elements and their approximation properties. It addresses the all-purpose Lagrange finite elements, but also vector-valued finite elements that are crucial to approximate the divergence and the curl operators. In addition, it also presents and analyzes quasi-interpolation operators and local commuting projections. The volume begins with four chapters on functional analysis, which are packed with examples and counterexamples to familiarize the reader with the basic and useful facts on Lebesgue integration and weak derivatives. Volume I also reviews important implementation aspects when either developing or using a finite element toolbox, including the orientation of meshes and the enumeration of the degrees of freedom. weiterlesen