The Sixteen Trees of The Somme by Lars Mytting

For the gardener, farmer, or homeowner, a good scythe is an efficient and enjoyable tool for cutting grasses and weeds and harvesting small grains. Author David Tresemer presents the results of years of research and practical experience so that the reader may learn to use and enjoy the scythe. In an age when most wonder how they can accomplish anything without the aid of electricity or gasoline, The Scythe Book shows how a traditional hand tool can often outperform more modern technology.

The aim of the present book is to give a systematic treatment of the inverse problem of the calculus of variations, i.e. how to recognize whether a system of differential equations can be treated as a system for extremals of a variational functional (the Euler-Lagrange equations), using contemporary geometric methods. Selected applications in geometry, physics, optimal control, and general relativity are also considered. The book includes the following chapters: - Helmholtz conditions and the method of controlled Lagrangians (Bloch, Krupka, Zenkov) - The Sonin-Douglas's problem (Krupka) - Inverse variational problem and symmetry in action: The Ostrogradskyj relativistic third order dynamics (Matsyuk.) - Source forms and their variational completion (Voicu) - First-order variational sequences and the inverse problem of the calculus of variations (Urban, Volna) - The inverse problem of the calculus of variations on Grassmann fibrations (Urban).

This book explores the key conceptual features of the development of the Sociology of Work (SoW) in Europe since 1945, using eleven country case studies.

From the bestselling author of The Sleepwalkers comes an epic history of the 1848 revolutions that swept Europe, and the charismatic figures who propelled them forward—“a beautifully written, richly detailed account of a historical moment that rhymes and resonates, in many strange ways, with our own era of turmoil and disruption” (Amitav Ghosh, author of Sea of Poppies).