Unsolved Problems in Number Theory. 3 ed., Guy, Richard
Автор: Randic, M., Название: Solved and Unsolved Problems of Structural Chemistry ISBN: 1498711510 ISBN-13(EAN): 9781498711517 Издательство: Taylor&Francis Рейтинг: Цена: 27562.00 р. Наличие на складе: Поставка под заказ.
Описание:
Solved and Unsolved Problems of Structural Chemistry introduces new methods and approaches for solving problems related to molecular structure. It includes numerous subjects such as aromaticity--one of the central themes of chemistry--and topics from bioinformatics such as graphical and numerical characterization of DNA, proteins, and proteomes. It also outlines the construction of novel tools using techniques from discrete mathematics, particularly graph theory, which allowed problems to be solved that many had considered unsolvable.
The book discusses a number of important problems in chemistry that have not been fully understood or fully appreciated, such as the notion of aromaticity and conjugated circuits, the generalized H ckel 4n + 2 Rule, and the nature of quantitative structure-property-activity relationships (QSARs), which have resulted in only partially solved problems and approximated solutions that are inadequate. It also describes advantages of mathematical descriptors in QSAR, including their use in screening combinatorial libraries to search for structures with high similarity to the target compounds.
Selected problems that this book addresses include:
Multiple regression analysis (MRA)
Insufficient use of partial ordering in chemistry
The role of Kekul valence structures
The problem of protein and DNA alignment
Solved and Unsolved Problems of Structural Chemistry collects results that were once scattered in scientific literature into a thoughtful and compact volume. It sheds light on numerous problems in chemistry, including ones that appeared to have been solved but were actually only partially solved. Most importantly, it shows more complete solutions as well as methods and approaches that can lead to actualization of further solutions to problems in chemistry.
Автор: Crane Robert, Fryer Christopher Название: Crane: Sex, Celebrity, and My Father`s Unsolved Murder ISBN: 081316074X ISBN-13(EAN): 9780813160740 Издательство: Mare Nostrum (Eurospan) Рейтинг: Цена: 3756.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: "On June 29, 1978, Bob Crane, known to Hogan`s Heroes fans as Colonel Hogan, was discovered brutally murdered in his Scottsdale, Arizona, apartment. His eldest son, Robert Crane, was called to the crime scene. In this poignant memoir, Robert Crane discusses that terrible day and how he has lived with the unsolved murder of his father. But this storyline is just one thread in his tale of growing up in Los Angeles, his struggles to reconcile the good and sordid sides of his celebrity father, and his own fascinating life. Crane began his career writing for Oui magazine and spent many years interviewing celebrities for Playboy--stars such as Chevy Chase, Bruce Dern, Joan Rivers, and even Koko the signing gorilla. As a result of a raucous encounter with the cast of Canada`s SCTV, he found himself shelving his notepad and tape recorder to enter the employ of John Candy--first as an on-again, off-again publicist; then as a full-time assistant, confidant, screenwriter, and producer; and finally as one of Candy`s pallbearers. Through disappointment, loss, and heartbreak, Crane`s humor and perseverance shine. Beyond the big stars and behind-the-scenes revelations, this riveting account of death, survival, and renewal in the shadow of the Hollywood sign makes a profound statement about the desire for love and permanence in a life where those things continually slip away. By turns shocking and uplifting, Crane is an unforgettable and deeply human story"--Provided by publisher.
Описание: Presents an elementary introduction to number theory and its different aspects: approximation of real numbers, irrationality and transcendence problems, continued fractions, diophantine equations, quadratic forms, arithmetical functions and algebraic number theory.
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