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 xii
89 – 1 inverse function. . . . . . . . . 14 – 1 - • |f (D) £- - - - - - - - i: (X,d) semimetric space . . . . . . 135 • “. ... ....." . . . . . . diam(A) diameter . . . . . . . . . . . . . . 135 !
89 – 1 inverse function. . . . . . . . . 14 – 1 - • |f (D) £- - - - - - - - i: (X,d) semimetric space . . . . . . 135 • “. ... ....." . . . . . . diam(A) diameter . . . . . . . . . . . . . . 135 !
Pagina 14
If f is an injective function, then {(y,z) (x, y) e f} is a function; it is denoted by f" and called the INVERSE of f; this inverse is clearly injective also and has inverse f. If f is a function and X and Y are supersets of dom(f) and ...
If f is an injective function, then {(y,z) (x, y) e f} is a function; it is denoted by f" and called the INVERSE of f; this inverse is clearly injective also and has inverse f. If f is a function and X and Y are supersets of dom(f) and ...
Pagina 15
If B C Y, then the set {a e X | f(a) e B} is often denoted by f*(B) and is called the INVERSE IMAGE of B under f (this does not imply the existence of a function f"). If C C P(X), the subset {f(A) | A e C} of P(Y) may be denoted by ...
If B C Y, then the set {a e X | f(a) e B} is often denoted by f*(B) and is called the INVERSE IMAGE of B under f (this does not imply the existence of a function f"). If C C P(X), the subset {f(A) | A e C} of P(Y) may be denoted by ...
Pagina 20
Show that the INVERSE {(a,b) (b,a) € r} of r is also a relation. Then show that a relation is a function if and only if it is the inverse of an injective relation. 1.3 Ordered Sets Order Relations Definition 1.3.1 Suppose S is a set.
Show that the INVERSE {(a,b) (b,a) € r} of r is also a relation. Then show that a relation is a function if and only if it is the inverse of an injective relation. 1.3 Ordered Sets Order Relations Definition 1.3.1 Suppose S is a set.
Pagina 24
It is left as an exercise (Q 1.3.5) to prove that inverses of similarity maps are also similarity maps. The following proposition that similarity behaves like an equivalence relation then follows from 1.2.20. Theorem 1.3.17 Suppose A, ...
It is left as an exercise (Q 1.3.5) to prove that inverses of similarity maps are also similarity maps. The following proposition that similarity behaves like an equivalence relation then follows from 1.2.20. Theorem 1.3.17 Suppose A, ...
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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