A Course in Complex Analysis and Riemann Surfaces by Wilhelm Schlag

By Wilhelm Schlag

Advanced research is a cornerstone of arithmetic, making it a necessary portion of any region of analysis in graduate arithmetic. Schlag's therapy of the topic emphasizes the intuitive geometric underpinnings of effortless complicated research that evidently bring about the idea of Riemann surfaces. The publication starts off with an exposition of the elemental thought of holomorphic capabilities of 1 advanced variable. the 1st chapters represent a pretty fast, yet complete path in advanced research. The 3rd bankruptcy is dedicated to the learn of harmonic capabilities at the disk and the half-plane, with an emphasis at the Dirichlet challenge. beginning with the fourth bankruptcy, the speculation of Riemann surfaces is built in a few element and with entire rigor. From the start, the geometric facets are emphasised and classical issues equivalent to elliptic capabilities and elliptic integrals are awarded as illustrations of the summary thought. The distinctive position of compact Riemann surfaces is defined, and their reference to algebraic equations is tested. The publication concludes with 3 chapters dedicated to 3 significant effects: the Hodge decomposition theorem, the Riemann-Roch theorem, and the uniformization theorem. those chapters current the center technical equipment of Riemann floor idea at this point. this article is meant as a reasonably unique, but fast moving intermediate advent to these components of the speculation of 1 complicated variable that appear most beneficial in different parts of arithmetic, together with geometric staff thought, dynamics, algebraic geometry, quantity conception, and practical research. greater than seventy figures serve to demonstrate thoughts and ideas, and the various difficulties on the finish of every bankruptcy supply the reader plentiful chance for perform and self reliant examine.

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Extra resources for A Course in Complex Analysis and Riemann Surfaces

Example text

For this, one needs to define the integral along a continuous curve via analytic continuation of primitives. 4 becomes a corollary of the monodromy theorem; see Theorem 2. 19 below. 3. Isolated singularities and residues We now consider isolated singularities of holomorphic functions. 1l(f2 f!. 5. Suppose f E \ {zo}) where zo E Then zo is called an isolated singularity of f. We say that zo is removable if f can be assigned a value f ( zo) E C at zo that renders f holomorphic on all of n.

The dz, dz formalism is known as Wirtinger calculus. 9. Problems { Zj }j mj > 1 � j � �J= l mj = 1 = 1 z = �J=I mj Zj. z separates { Zj }j= 1 {zj }J=I Problem 1 . 2 . Suppose Po > P l > P2 > > Pn > 0. Prove that all zeros of the polynomial P(z) = �J= O Pi zi lie in {lz l > 1}. 3. Let P(z) = �J=O aj zi be a polynomial of degree 2:: 1 1 n with all roots inside the unit circle l z l < 1 . Define P*(z) = z P(z ) where P( z) = �J=O aj zi. Show that all roots of P(z) + P* (z) = 0 lie on the unit circle l z l = 1.

Problem 1 . 7. Prove ( 1 . 20) without using complex analysis. I n other words, use only real-variable methods. Show that your proof carries over to all dimensions, and thus obtain the maximum principle for harmonic functions in all dimensions. 8. Find the holomorphic function part and such that f (0) = f(z) = f(x + iy) with real x( l + x 2 + y 2 ) 1 + 2x 2 - 2y 2 + (x 2 + y 2 ) 2 0. 9. This exercise highlights properties of infinite series of com­ plex numbers, and how they differ from real series: E ( a) Suppose {zj }�1 C {z C : Re z 2: O} is a given sequence.

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