Download A course on geometric group theory by Brian H Bowditch PDF

By Brian H Bowditch

This quantity is meant as a self-contained advent to the fundamental notions of geometric staff conception, the most principles being illustrated with a variety of examples and routines. One target is to set up the rules of the idea of hyperbolic teams. there's a short dialogue of classical hyperbolic geometry, so as to motivating and illustrating this.

The notes are according to a path given by means of the writer on the Tokyo Institute of expertise, meant for fourth 12 months undergraduates and graduate scholars, and will shape the foundation of the same direction in other places. Many references to extra refined fabric are given, and the paintings concludes with a dialogue of varied parts of modern and present research.

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Schwarz Reflection Principle: Let u ( x ) be defined and continuous in the closed hemisphere 1x1 S 1, x, 2 0. Suppose u(x) = 0 for x, = 0 and that u(x) is harmonic in the open hemisphere. *,~,-1, -xn) 1 x 3Z , * * * , x n - l ? x n ) = to obtain a function continuous in 1x1 5 1 and harmonic in 1x1 c 1. PROOF: Given x in R", we write x' for the reflection, that is, the point with the same coordinates except x; = -x, . Our extension formula then is conveniently written u ( x ) = -u(x'). Let f ( y ) be the restriction of u(x) to 1x1 = 1, x, 2 0; we extend f(y) by the equation f ( y ) = - f ( y ' ) to obtain a function defined and continuous on the sphere lyl = I .

We suppose that p is an outer measure on X . When a function f(x) is measurable and nonnegative, we admit the value + co in the definition of the integral. If f,(x) is a sequence of nonnegative measurable Theorem (Fatou): functions on X then Slim inf j n ( x )d p ( x ) 5 lim inf J j n ( x )d p ( x ) . ) dp(x) exists and equals b(x) d p ( x ) . 5, 25 MUSURE AND INTEGRATION We also recall the definition of the spaces L p ( X ,p): for 1 6 p < 00, this is the space of all p-measurable functionsf(x) on X for which the integral /If (X)lP &(x) is finite and the pth root of this integral, written Ilfll,, is a norm on the linear space LP(X, p).

1 s, Au d x d r . Thus, if we suppose AM2 0 inside a sphere 1x1 < R , then for all r < R we have u(0) S / u ( r , 0) d w ( 0 ) . It follows that if u ( x ) is C2 in an open set G where AMis nonnegative, then for any x in G and any r smaller than the distance of x to the boundary, we have u(x) S Iu ( x + r z ) dw(z) I n this case we say that u is subharmonic in G . Similarly, if AM5 0 in G we have the reverse inequality; u(x) is superharmonic in G. Finally, for A M = 0 in G, we have equality, and we say that u(x) is harmonic in G.

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