Giovanni Costa

Sisältää harjoituksia rentoutumiseen, kehonmuokkaukseen, alaselän hyvinvointiin, lämmittelyyn, keskivartalon lihasvoiman kasvattamiseksi ja stressin lievitykseen.Nyt on aika kohottaa kuntoa! Helpon 30 päivän tre-niohjelman avulla karistat kiloja, terävöität ajattelukykyäsi ja nautit elämästä. Kun merkitset ylös kuntotasosi alusta alkaen, huomaat pian, kuinka hyvinvointisi paranee päivä päivältä.

Symmetries, coupled with the mathematical concept of group theory, are an essential conceptual backbone in the formulation of quantum field theories capable of describing the world of elementary particles. This primer is an introduction to and survey of the underlying concepts and structures needed in order to understand and handle these powerful tools. Specifically, in Part I of the book the symmetries and related group theoretical structures of the Minkowskian space-time manifold are analyzed, while Part II examines the internal symmetries and their related unitary groups, where the interactions between fundamental particles are encoded as we know them from the present standard model of particle physics. This book, based on several courses given by the authors, addresses advanced graduate students and non-specialist researchers wishing to enter active research in the field, and having a working knowledge of classical field theory and relativistic quantum mechanics. Numerous end-of-chapter problems and their solutions will facilitate the use of this book as self-study guide or as course book for topical lectures.

After a brief survey of biotopic and vegetational features and an account of the main groups of desert animals, the most unusual patterns of the behaviour of the xerophilous fauna are examined. The importance of the thermohygric regulation and self-protective and locomotor mechanisms to the survival of arid-adapted animals is emphasized and various adaptations in the alimentary, reproductive and social spheres are analyzed.The clear and fluent treatment will awaken the interest of the reading public, from the amateur naturalists to research scientists.