Over seventy years ago, Richard Bellman coined the term “the curse of dimensionality” to describe phenomena and computational challenges that arise in high dimensions. These challenges, in tandem with the ubiquity of high-dimensional functions in real-world applications, have led to a lengthy, focused research effort on high-dimensional approximation—that is, the development of methods for approximating functions of many variables accurately and efficiently from data. This book provides an in-depth treatment of one of the latest installments in this long and ongoing story: sparse polynomial approximation methods. These methods have emerged as useful tools for various high-dimensional approximation tasks arising in a range of applications in computational science and engineering. It begins with a comprehensive overview of best s-term polynomial approximation theory for holomorphic, high-dimensional functions, as well as a detailed survey of applications to parametric differential equations. It then describes methods for computing sparse polynomial approximations, focusing on least squares and compressed sensing techniques. Sparse Polynomial Approximation of High-Dimensional Functions presents the first comprehensive and unified treatment of polynomial approximation techniques that can mitigate the curse of dimensionality in high-dimensional approximation, including least squares and compressed sensing. It develops main concepts in a mathematically rigorous manner, with full proofs given wherever possible, and it contains many numerical examples, each accompanied by downloadable code. The authors provide an extensive bibliography of over 350 relevant references, with an additional annotated bibliography available on the book’s companion website (www.sparse-hd-book.com). This text is aimed at graduate students, postdoctoral fellows, and researchers in mathematics, computer science, and engineering who are interested in high-dimensional polynomial approximation techniques.
The purpose of this book is to seek a fuller understanding of how the characterisation of Paul in Acts would have been perceived by those who first read or heard the Lucan narrative. As the author makes clear, the careful reader of Acts should be amazed at the way St Paul is portrayed therein. Dr Lentz demonstrates, through a careful examination of particular texts, the great improbability that a Jew of strict Pharisaic background would have held, let alone been proud of, Roman citizenship and citizenship of the city of Tarsus. By investigating the social and legal expectations of the first century, the author shows that Paul is seen to be deferred to in matters of legal minutiae by those in positions of authority. He is given high social status and abundant moral virtue in order to attract to Christianity the high-ranking citizen who would recognise in Paul the classical cardinal virtues.
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