Economics is a highly respected and successful textbook, valued world-wide by students for its comprehensive and engaging coverage of introductory economics. The book presents economics as an interesting, lively and relevant subject and it helps students to see how the world works by developing “an economic way of thinking” Its clarity of exposition, lively examples and quality full-colour artwork help bring the subject powerfully to life in the 21st century. Its aim is to accurately reflect and encompass the constantly shifting economic world around us.
The advantages of using both eyes for astronomical observing are many and considerable, largely because of the way the human brain processes visual information. Binoculars – the usual kinds – are incredibly useful for wide-field observing, but "binocular astronomy" is much more than that, including binocular eyepieces that can be fitted to normal astronomical telescopes, and even giant binocular telescopes that are effectively two astronomical telescopes working in tandem.
We always thought of ourselves as being at the center of the Universe and at rest. It was not until very recently that Copernicus explained how our Earth is orbiting the Sun and that the Sun, not the Earth, is at the center of our solar system. Today’s theories such as Einstein’s special and general relativity, still believe that we and our galaxy, are at the center of the Universe. In fact, relativity with its “cosmological principle” claims that any observer on any galaxy in the Universe can consider him or herself at the center and at rest.
The present book, stemmin g from the first four chap ters of the authors' Tensor Calculus (Moscow, 1969), constitutes a lucid and completely elementary introduction to linear algebra. The treatment is virtually self-contained. In fact, the mathematical background assumed on the part of the reader hardly exceeds a smattering of calculus and a casual acquaintance with determinants. A special merit of the book, reflecting its lineage, is its free use of tensor notation, in particular the Einstein summation convention.
