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EBONY is the flagship magazine of Johnson Publishing. Founded in 1945 by John H. Johnson, it still maintains the highest global circulation of any African American-focused magazine.
This book offers insights into important trends and future scenarios in the global tourism and travel industry. Besides the general topics (aviation and hospitality industry, destination management, marketing, and distribution management) it analyses current challenges and impacts resulting especially from developments in social media, corporate social responsibility and eco-mobility. Sustainability in the global tourism sector and particularly eco-mobility is one of the top themes to-be and therefore a focus of this book. Among the contributors to the book are well-known notabilities from institutions such as the UNWTO and top executives of various segments of the tourism and travel industry. The articles are based on presentations and panel discussions presented at the world ́s largest tourism convention, the ITB Berlin Convention.
Each number is the catalogue of a specific school or college of the University.
The material presented here corresponds to Fermi lectures that I was invited to deliver at the Scuola Normale di Pisa in the spring of 1998. The obstacle problem consists in studying the properties of minimizers of the Dirichlet integral in a domain D of Rn, among all those configurations u with prescribed boundary values and costrained to remain in D above a prescribed obstacle F. In the Hilbert space H1(D) of all those functions with square integrable gradient, we consider the closed convex set K of functions u with fixed boundary value and which are greater than F in D. There is a unique point in K minimizing the Dirichlet integral. That is called the solution to the obstacle problem.
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