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Alexandr Danilovich Alexandrov has been called a giant of 20th-century mathematics. This volume contains some of the most important papers by this renowned geometer and hence, some of his most influential ideas. Alexandrov addressed a wide range of modern mathematical problems, and he did so with intelligence and elegance, solving some of the discipline's most difficult and enduring challenges. He was the first to apply many of the tools and methods of the theory of real functions and functional analysis that are now current in geometry. The topics here include convex polyhedrons and closed surfaces, an elementary proof and extension of Minkowski's theorem, Riemannian geometry and a method for Dirichlet problems. This monograph, published in English for the first time, gives unparalleled access to a brilliant mind, and advanced students and researchers in applied mathematics and geometry will find it indispensable.
Being in the forest lifts your spirit like nothing else. A walk in the woods always makes you feel better. Here's a special journal dedicated to the special connection we have with things growing in the forest. On the cover is a wonderful close up of an oak tree on an early summer night. And here's your companion journal to record all about your woods walks. Places to note special animal sightings, write down the flowers you see, press a leaf or two between the pages, journal about how good the woods make you feel. 5.5 x 8.5" lightweight enough to easily tuck into your bag the next time you venture out. Splendor!
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