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Reprint of the original, first published in 1873. The publishing house Anatiposi publishes historical books as reprints. Due to their age, these books may have missing pages or inferior quality. Our aim is to preserve these books and make them available to the public so that they do not get lost.
This book offers an account of a number of aspects of operator theory, mainly developed since the 1980s, whose problems have their roots in quantum theory. The research presented is in non-commutative operator approximation theory or, to use Halmos' terminology, in operator approximants. Focusing on the concept of approximants, this self-contained book is suitable for graduate courses.
From Philip Kerr, the New York Times bestselling author of the Bernie Gunther novels, comes a breathtaking journey of survival in the dark days of WWII in Ukraine, a country that remains tumultuous today. This inspiring tale captures the power of the human spirit and is perfect for fans of The Book Thief, Milkweed, and The Boy in the Striped Pajamas. It will soon be another cold winter in the Ukraine. But it's 1941, and things are different this year. Max, the devoted caretaker of an animal preserve, must learn to live with the Nazis who have overtaken this precious land. He must also learn to keep secrets—for there is a girl, Kalinka, who is hiding in the park. Kalinka has lost her home, her family, her belongings—everything but her life. Still, she has gained one small, precious gift: a relationship with the rare wild and wily Przewalski's horses that wander the preserve. Aside from Max, these endangered animals are her only friends—until a Nazi campaign of extermination nearly wipes them out for good. Now Kalinka must set out on a treacherous journey across the frozen forest to save the only two surviving horses—and herself.