Glaciers and Glaciology of Alaska

• Record Nr.: UNINA9911019990503321
• Pubbl/distr/stampa: [Place of publication not identified], : American Geophysical Union, 1989
• ISBN: 1-118-66829-4
• Descrizione fisica: 1 online resource (338 pages)
• Disciplina: 551.312
• Soggetti: Glaciers
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Bibliographic Level Mode of Issuance: Monograph
• Sommario/riassunto: The field trip Glaciers and Glaciology of Alaska for the 28th International Geological Congress will begin in Anchorage on 21 July 1989 and end in Juneau on 29 July 1989. Travel will be by bus, charter boat, and charter aircraft, with stops at Portage Glacier, Whittier, Columbia Glacier, Valdez, Yakutat, Glacier Bay, and Juneau. There is nearly 75,000 square kilometers of glacier ice in Alaska. The major portion is concentrated in the Chugach and St. Elias Ranges through which the field trip traverses. In the region are major advancing and retreating tidewater glaciers, major piedmont glaciers, and surging glaciers. Columbia Glacier is in the early stage of a drastic retreat; Hubbard Glacier is advancing and recently dammed a major fjord; Variegated Glacier recently made a major surge; the glaciers in Glacier Bay underwent a drastic retreat during the last two centuries, resulting in a glacially formed landscape that has only a recent vegetation cover. Southern Alaska has a diverse history, climate, botany, and zoology. Many of the original native cultures of North America came together in Prince William Sound. Russian fur traders and gold miners came and went, and fishing and tourism dominate the present economy. The climate of southern Alaska is maritime, with substantial precipitation and mild temperatures. The topography has a strong effect on the maritime air masses, resulting in heavy snowfalls and the development of active glaciers on seaward-facing slopes. The succession of vegetation is remarkable, ranging from barren, recently ice-free areas ; to forest-suffocating muskeg. Southern Alaska also is known for an abundance of marine mammals, including sea otter, seal, sea lion, porpoise, and various species of whales. On land, bear, moose, deer, wolverine, and mountain goat are common; other wildlife is abundant also.

Linear Algebraic Groups / / by Armand Borel

• Record Nr.: UNINA9910961073003321
• Autore: Borel Armand
• Pubbl/distr/stampa: New York, NY : , : Springer New York : , : Imprint : Springer, , 1991
• ISBN: 1-4612-0941-2
• Edizione: [2nd ed. 1991.]
• Descrizione fisica: 1 online resource (XI, 290 p.)
• Collana: Graduate Texts in Mathematics, , 2197-5612 ; ; 126
• Disciplina: 512.55; 512.482
• Soggetti: Topological groups; Lie groups; Topological Groups and Lie Groups
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Bibliographic Level Mode of Issuance: Monograph
• Nota di bibliografia: Includes bibliographical references and indexes.
• Nota di contenuto: AG—Background Material From Algebraic Geometry -- §1. Some Topological Notions -- §2. Some Facts from Field Theory -- §3. Some Commutative Algebra -- §4. Sheaves -- §5. Affine K-Schemes, Prevarieties -- §6. Products; Varieties -- §7. Projective and Complete Varieties -- §8. Rational Functions; Dominant Morphisms -- §9. Dimension -- §10. Images and Fibres of a Morphism -- §11. k-structures on K-Schemes -- §12. k-Structures on Varieties -- §13. Separable points -- §14. Galois Criteria for Rationality -- §15. Derivations and Differentials -- §16. Tangent Spaces -- §17. Simple Points -- §18. Normal Varieties -- References -- I—General Notions Associated With Algebraic Groups -- §1. The Notion of an Algebraic Groups -- §2. Group Closure; Solvable and Nilpotent Groups -- §3. The Lie Algebra of an Algebraic Group -- §4. Jordan Decomposition -- II — Homogeneous Spaces -- §5. Semi-Invariants -- §6. Homogeneous ; Spaces -- §7. Algebraic Groups in Characteristic Zero -- III Solvable Groups -- §8. Diagonalizable Groups and Tori -- §9. Conjugacy Classes and Centralizers of Semi-Simple Elements -- §10. Connected Solvable Groups -- IV—Borel Subgroups; Reductive Groups -- §11. Borel Subgroups -- §12. Cartan Subgroups; Regular Elements -- §13. The Borel Subgroups Containing a Given Torus -- §14. Root Systems and Bruhat Decomposition in Reductive Groups -- V—Rationality Questions -- §15. Split Solvable Groups and Subgroups -- §16. Groups over Finite Fields -- §17. Quotient of a Group by a Lie Subalgebra -- §18. Cartan Subgroups over the Groundfield. Unirationality. Splitting of Reductive Groups -- §19. Cartan Subgroups of Solvable Groups -- §20. Isotropic Reductive Groups -- §21. Relative Root System and Bruhat Decomposition for Isotropic Reductive Groups -- §22. Central Isogenies -- §23. Examples -- §24. Survey of Some Other Topics -- A. Classification -- B. Linear Representations -- C. Real Reductive Groups -- References for Chapters I to V -- Index of Definition -- Index of Notation.
• Sommario/riassunto: This book is a revised and enlarged edition of "Linear Algebraic Groups", published by W.A. Benjamin in 1969. The text of the first edition has been corrected and revised. Accordingly, this book presents foundational material on algebraic groups, Lie algebras, transformation spaces, and quotient spaces. After establishing these basic topics, the text then turns to solvable groups, general properties of linear algebraic groups and Chevally's structure theory of reductive groups over algebraically closed groundfields. The remainder of the book is devoted to rationality questions over non-algebraically closed fields. This second edition has been expanded to include material on central isogenies and the structure of the group of rational points of an isotropic reductive group. The main prerequisite is some familiarity with algebraic geometry. The main notions and results needed are summarized in a chapter with references and brief proofs.