Download A Course in Point Set Topology (Undergraduate Texts in by John B. Conway PDF

By John B. Conway

This textbook in aspect set topology is aimed toward an upper-undergraduate viewers. Its mild speed might be priceless to scholars who're nonetheless studying to put in writing proofs. must haves comprise calculus and no less than one semester of study, the place the scholar has been competently uncovered to the tips of easy set idea corresponding to subsets, unions, intersections, and capabilities, in addition to convergence and different topological notions within the genuine line. Appendices are integrated to bridge the distance among this new fabric and fabric present in an research direction. Metric areas are one of many extra ordinary topological areas utilized in different components and are consequently brought within the first bankruptcy and emphasised through the textual content. This additionally conforms to the strategy of the e-book first of all the actual and paintings towards the extra normal. bankruptcy 2 defines and develops summary topological areas, with metric areas because the resource of notion, and with a spotlight on Hausdorff areas. the ultimate bankruptcy concentrates on non-stop real-valued capabilities, culminating in a improvement of paracompact areas.

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Additional info for A Course in Point Set Topology (Undergraduate Texts in Mathematics)

Example text

Now, let not converge to a kernel. pletes the proof of the theorem. --+O. Consequently, fn«J IB n 1 does Again, we have reached a contradiction. Thus, the sequence converge in the disk < 1. : If,'"k (0) I (1 +Ie/I C1)1 > ~ throughout, the disk S9 §5. CONVERGENCE THEOREMS II. «) :; f.... «), and this con­ tradicts our assumption. verge uniformly on the closed disk to a func tion z = f«) that vanishes at 1(1 < 1 onto the do- . > 0 there exists a number 0, has positive first derivative at 0, and maps the open disk main B, it is necessary and sufficient that for every f N> 0 such that, for n> N, there exists a continuous one-to-one correspondence between the points of the curves Cn and C such that the distance between any point of C n and'the corresponding point of C will be less than f.

De­ = I converges to Ifn«) I denote a se- by C . Suppose that the sequence {B n 1'1 are uniformly bounded inside the disk exist two subsequences I n a q uence of functions f n «) such that, for each n, f n (0) = 0, f'n (0) > 0, and f n <0 maps the open disk < 1 onto the domain B n. For the sequence {f,,«)1 to con- If"k~)I;;:;':lf~k(O)ll1lCJ'\1 that the images of the disk n domains each including the point z domain B (its kernel) bounded by a Jordan curve C. Let conclude from the inequality = to a finite function.

Has a subsequence that converges uniformly inside B to a regular function or to eian r 1 -I a II 00. This proves that the sequence la n 1 has no cluster 00. The situation is analogous with the remaining vertices of the domain B. Since each of the points z k is the image of a vertex of the triangle B under one of the functions z' no cluster points in 'zl < I, = 'ill "" I[(z) I of functions that are regular in a domain B is said to be normal in B if every sequence of functions belonging to that family 1-1 all = so that Ia n I -> 1 as n -- sults in turn lead to considerabl e further development of questions on the con­ by Montel, of a normal family of analytic functions (d.

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