出版時間:2009-4 出版社:世界圖書出版公司 作者:哈爾莫斯 頁數(shù):369
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前言
The only way to learn mathematics iS to do mathematics.That tenet iS the foundation of the do.it.yourself,Socratic,or Texas method。the method in which the teacher plays the role of an omniscient but largely uncommuni. cative referoe between the learner and the facts.Although that method iS usually and perhaps necessarily oral。this book tries to use the same method to give a written exposition of certain topics in Hilben space theory. The right way to read mathematics iS first to read the definitions of the concepts and the statements of the theorems,and then,putting the book aside,to try to discover the appropriate proofs.If the theorems are not trivial,the attempt might fail,but it iS likely to bc instructive just the same. To the passive reader a routine computation and a miracle of ingenuity come with equal ease,and later,when he must depend on himself。he will find that they went as easily as they came.The active reader,who has found out what does not work.iS in a much better position to understand the reason ror the SUCCESS of the author’S method,and。Iater,to find answers that are not in books. This book was written for the active reader.Thc first part consists of problems,frequently preceded by definitions and motivation。and some. times followed by corollaries and historical remarks.Most of the problems are statements to be proved,but some are questions(is it?。what is?),and some are challenges(construct,determine).The second part,a very short one,consists of hints.A hint iS a word。or a paragraph,usually intended to help the reader find a solution.The hint itself iS not necessarily a con. densed solution of the problem:it may iust point to what I regard as the heart of the matter.Sometimes a problem contains a trap,and the hint may serve to chide the reader for rushing in too recklessly.The third part.
內(nèi)容概要
This book was written for the active reader. The first part consists of problems, frequently preceded by definitions and motivation, and some-times followed by corollaries and historical remarks. Most of the problems are statements to be proved, but some are questions (is it?, what is?), and some are challenges (construct, determine). The second part, a very short one, consists of hints. A hint is a word, or a paragraph, usually intended to help the reader find a solution. The hint itself is not necessarily a con-densed solution of the problem; it may just point to what I regard as the heart of the matter. Sometimes a problem contains a trap, and the hint may serve to chide the reader for rushing in too recklessly. The third part, the longest, consists of solutions: proofs, answers, or constructions, depending on the nature of the problem
書籍目錄
1. VECTORS 1. Limits of quadratic forms 2. Schwarz inequality 3. Representation of linear functionals 4. Strict convexity 5. Continuous curves 6. Uniqueness of crinkled arcs 7. Linear dimension 8. Total sets 9. Infinitely total sets 10. Infinite Vandermondes 11. T-total sets 12. Approximate bases2. SPACES 13. Vector sums 14. Lattice of subspaces 15. Vector sums and the modular law 16. Local compactness and dimension 17. Separability and dimension 18. Measure in Hiibert space3. WEAK TOPOLOGY 19. Weak closure of subspaces 20. Weak continuity of norm and inner product 21. Semicontinuity of norm 22. Weak separability 23. Weak compactness of the unit bali 24. Weak metrizabilitv of the unit ball 25. Weak closure of the unit sphere 26. Weak metrizability and separability 27. Uniform boundedness 28. Weak metrizability of Hilbert space 29. Linear functionals on /2 30. Weak completeness4. ANALYTIC FUNCTIONS 31. Analytic Hilbert spaces 32. Basis for Ae 33. Real functions in He 34. Products in H2 35. Analytic characterization of H2 36. Functional Hilbcrt spaces 37. Kernel functions 38. Conjugation in functional Hilbert spaces 39. Continuity of extension 40. Radial limits 41. Bounded approximation 42. Multiplicativity of extension 43. Dirichlet problem5. INFINITE MATRICES 44. Column-finite matrices 45. Schur test 46. Hilbert matrix 47. Exponential Hilbert matrix 48. Positivity of the Hilbert matrix 49. Series of vectors6. BOUNDEDNESS AND INVERTIBILITY 50. Boundedness on bases 51. Uniform boundedness of linear transformations 52. lnvertible transformations 53. Diminishable complements 54. Dimension in inner-product spaces 55. Total orthonormal sets 56. Preservation of dimension 57. Projections of equal rank 58. Closed graph theorem 59. Range inclusion and factorization 60. Unbounded symmetric transformations7.MULTIPLICATION OPERATORS 61. Diagonal operators 62. Multiplications on 12 63. Spectrum of a diagonal operator 64. Norm of a multiplication……
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