Combinatorics of Train Tracks

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Princeton University Press, 1992 - Mathematics - 216 pages
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Measured geodesic laminations are a natural generalization of simple closed curves in surfaces, and they play a decisive role in various developments in two-and three-dimensional topology, geometry, and dynamical systems. This book presents a self-contained and comprehensive treatment of the rich combinatorial structure of the space of measured geodesic laminations in a fixed surface. Families of measured geodesic laminations are described by specifying a train track in the surface, and the space of measured geodesic laminations is analyzed by studying properties of train tracks in the surface. The material is developed from first principles, the techniques employed are essentially combinatorial, and only a minimal background is required on the part of the reader. Specifically, familiarity with elementary differential topology and hyperbolic geometry is assumed. The first chapter treats the basic theory of train tracks as discovered by W. P. Thurston, including recurrence, transverse recurrence, and the explicit construction of a measured geodesic lamination from a measured train track. The subsequent chapters develop certain material from R. C. Penner's thesis, including a natural equivalence relation on measured train tracks and standard models for the equivalence classes (which are used to analyze the topology and geometry of the space of measured geodesic laminations), a duality between transverse and tangential structures on a train track, and the explicit computation of the action of the mapping class group on the space of measured geodesic laminations in the surface.

 

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Contents

III
3
IV
4
V
10
VI
18
VII
39
VIII
60
IX
68
X
82
XVII
139
XVIII
145
XIX
154
XX
160
XXI
173
XXII
174
XXIII
182
XXIV
188

XI
102
XII
115
XIII
116
XIV
124
XV
127
XVI
133
XXV
191
XXVI
204
XXVII
210
XXVIII
214
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About the author (1992)

Penner-Univ of Southern California

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