# Download A Primer on Riemann Surfaces by A. F. Beardon PDF

By A. F. Beardon

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I'm utilizing it at once in tenth grade (my tuition does Algebra 2 in ninth grade) and that i love this e-book since it is simple to appreciate, provides definitions in an easy demeanour and lots of examples with solutions. the matter units are at such a lot 30 difficulties (which is excellent for homework compared to the 40-100 difficulties I acquired final 12 months) and a few of the unusual solutions are available the again to examine your paintings! The chapters are good divided and provides you adequate details that you can digest all of it and luxuriate in geometry. i am certain the problem will are available in later chapters :)

Extra info for A Primer on Riemann Surfaces

Example text

In Thus an open subset of 3Rn C(x), [y] is open we have is connected if and only if it is arcwise connected. 61 3 2 1. Show that if connected. Deduce that each 2. Let D E is a connected subset of C(x) points X then E is is closed. be a domain in 3Rn . can be joined by a simple curve in 3. Let X, Show that any two points in D D. be the plane set consisting of the origin and the (x, sin 1/x), x > 0. Show that [o] = Co} * C(O). Deduce that X is connected but not arcwise connected. 7 QUOTIENT SPACES Let If we give Y T be a topology on a topology, then a largest topology T^ on Y f X and let f : X Y be any function.

We define a Riemann surface as an abstract surface rather than an intuitive model for some many-valued function. We then obtain explicit examples of surfaces. 1 SURFACES A surface S is a topological space, each point of which appears (topologically) to lie in an open subset of (C. Although one naturally thinks of surfaces as lying within JR^, we shall not insist that this is so: indeed, the essential idea is to define a surface in its own right without it being necessary to discuss the possible existence of any larger space containing it.

5) The continuous image of a compact set is compact. (6) A continuous bijection of a compact space onto a Hausdorff space is a homeomorphism. As an illustration of the ideas involved, we pause to prove (6) and give a particularly attractive application of it. First, we give the proof. Suppose that and that Y X is compact, that f : X -»■ Y is Hausdorff. It is only necessary to prove that sets to open sets. If A is an open subset of and hence, by (3), compact. By (5), f(B) closed. Thus f find that is a continuous bijection Y - f(B) Y - f(B) is is open.