By Robert C. Penner

ISBN-10: 3037190752

ISBN-13: 9783037190753

There's an primarily “tinker-toy” version of a trivial package over the classical Teichmüller area of a punctured floor, known as the adorned Teichmüller house, the place the fiber over some degree is the gap of all tuples of horocycles, one approximately every one puncture. This version results in an extension of the classical mapping type teams known as the Ptolemy groupoids and to convinced matrix versions fixing similar enumerative difficulties, each one of which has proved helpful either in arithmetic and in theoretical physics. those areas take pleasure in numerous comparable parametrizations resulting in a wealthy and complicated algebro-geometric constitution tied to the already problematic combinatorial constitution of the tinker-toy version. certainly, the traditional coordinates provide the prototypical examples not just of cluster algebras but additionally of tropicalization. This interaction of combinatorics and coordinates admits extra manifestations, for instance, in a Lie thought for homeomorphisms of the circle, within the geometry underlying the Gauss product, in profinite and pronilpotent geometry, within the combinatorics underlying conformal and topological quantum box theories, and within the geometry and combinatorics of macromolecules.

This quantity offers the tale and wider context of those embellished Teichmüller areas as built through the writer during the last 20 years in a chain of papers, a few of them in collaboration. occasionally correcting mistakes or typos, occasionally simplifying proofs and occasionally articulating extra normal formulations than the unique examine papers, this quantity is self-contained and calls for little formal heritage. in accordance with a master’s path at Aarhus collage, it offers the 1st remedy of those works in monographic shape.

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Additional info for Decorated Teichmuller Theory

Sample text

We conclude that Euclidean diameters of horocycles in the upper half-plane scale by derivatives under the action of Möbius transformations. 7. u1 /. u1 /. u1 / to 3 . u1 / are disjoint. 4 3 taken with a positive sign if At the risk of proving beyond any doubt that we have too much spare time, let us remark that there is a musical instrument, the “hormonica”, based on this observation as follows. Begin with the Farey tesselation as the untuned instrument regarded as drawn before you on the computer screen.

For example, an especially beautiful combinatorial fact is that the continued fraction 26 1 The basics expansion of a rational number pq can be read off from the sequence of right or left turns in the Farey tesselation connecting the point i to pq . Let us just illustrate with 5 an example, the rational 13 . Starting from i one makes the following sequence of 5 to arrive at 13 : RRLRL. 4 and the definition of continued fractions) is left to the reader. 4, we may identify these two sets. Z/, then we let A act on the right on the points at infinity (following Gauss’ convention in fact), and hence on oriented geodesics, and shall thus identify an oriented edge of with the image under the right action of A of the distinguished oriented edge from 0 to 1.

H-length. Proof. 2 and the earlier calculation to arrange that the three u, be v, ab w. , x D p1 a . 2 be Now using 1 D h ; i, we find y D be uC p v D Dp 2be 2a a  1 , 2x so a be a be C ; 0; C 2be 2a 2be 2a à as a vector in R3 . Using the explicit mapping H ! x; y; z/ 7! z y x ; z 1 x /, we compute the imaginary part of the image of to be be ; since u, v, w respectively map a to 0; 1; 1, the hyperbolic segment lying in h. be v/ maps to the horizontal segment of a be a Euclidean length one at height a , which has hyperbolic length be using the expression for the hyperbolic metric in U.

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