## Elements of Abstract AnalysisIn nature's infinite book ofsecrecy A little I can read. Antony and Cleopatra, l. ii. This is a book about a few elementary concepts of analysis and the mathe matical structures which enfold them. It is more concerned with the interplay amongst these concepts than with their many applications. The book is self-contained; in the first chapter, after acknowledging the fundamental role ofmathematical logic, wepresent seven axioms of Set Theory; everything else is developed from these axioms. It would therefore be true, if misleading, to say that the reader requires no prior knowledge of mathematics. In reality, the reader we have in mind has that level of sophistication achieved in about three years of undergraduate study of mathematics and is already well acquainted with most of the structures discussed-rings, linear spaces, metric spaces, and soon-and with many ofthe principal analytical concepts convergence, connectedness, continuity,compactness and completeness. Indeed, it is only after gaining familiarity with these concepts and their applications that it is possible to appreciate their place within a broad framework of set based mathematics and to consolidate an understanding of them in such a framework. To aid in these pursuits, wepresent our reader with things familiar and things new side by side in most parts of the book-and we sometimes adopt an unusual perspective. That this is not an analysis textbook is clear from its many omissions. |

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Pagina xi

16 co-

16 co-

**domain**. . . . . . . . . . . . . . 14**domain**. . . . . . . . . . . . . . . . . 13 field of relation . . . . . . . . . 13 Tange . . . . . . . . . . . . . . . . . . . 13 infimum . . . . . . . . . . . 21, 100 maximum . Pagina 7

This looks rather like the action of a function whose

This looks rather like the action of a function whose

**domain**consists of those a for which such a y exists. What the axiom states is that, if we restrict this “function' to a “**domain**a which is known to be a set, then the “range' is ... Pagina 13

It has two important subsets, namely the

It has two important subsets, namely the

**DOMAIN**{x € field(r) | By : (x, y) € r} of r, denoted by dom(r), and the RANGE {y € field(r)| Ha! : (x, y) € r} of r, denoted by ran(r). It is easy to check that field(r) = dom(r) Uran(r) and ... Pagina 14

If f is a function and X and Y are supersets of dom(f) and ran(f) respectively, then we say that (f, X, Y), is a MAPPING OUT OF X into Y; we call Y the Co-

If f is a function and X and Y are supersets of dom(f) and ran(f) respectively, then we say that (f, X, Y), is a MAPPING OUT OF X into Y; we call Y the Co-

**DOMAIN**of f and denote it by codom(f); in the case where X = dom(f), we call (f, ... Pagina 15

Sometimes a function f is expressed by notation like a H. f(x), particularly where f(x) is determined by some formula; thus x → (x,a) denotes the function {(x, (x,a)) a € X} where the

Sometimes a function f is expressed by notation like a H. f(x), particularly where f(x) is determined by some formula; thus x → (x,a) denotes the function {(x, (x,a)) a € X} where the

**domain**X is either stated or is understood from the ...### Ce spun oamenii - Scrie o recenzie

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### Cuprins

Counting | 41 |

Algebraic Structure | 57 |

Analytic Structure | 91 |

Linear Structure | 115 |

Geometric Structure | 133 |

Topological Structure | 159 |

Continuity and Openness | 177 |

Connectedness | 207 |

Convergence | 215 |

Compactness | 231 |

Completeness | 245 |

Solutions | 269 |

Bibliography | 285 |

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### Termeni și expresii frecvente

acc(A algebra arbitrary Axiom of Choice Banach bijective bounded called cardinal closed subset commutative compact space converges convex counting number defined Definition denoted dense disjoint dom(r domain endowed ensures equivalent Example EXERCISES Q exists f is continuous field F filter finite subset follows Hausdorff space Hilbert space homomorphism includes induction initial topology injective injective function intersection inverse isometric Lemma linear subspace linearly independent maximal subspace metric space nbd(x non-empty set non-empty subset non-trivial normed linear space notation oo U oo open ball open neighbourhood open subset order isomorphism ordered set ordinal Proof Let Proof Suppose ps(X quotient real numbers Recursive relative topology second countable semimetric space seminormed seminormed linear space Show spaces and f subbase Suppose f surjective topological space topology determined totally ordered ultrafilter union unique unit ball vector space whence