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Topics Surrounding the Combinatorial Anabelian Geometry of Hyperbolic Curves II

Tripods and Combinatorial Cuspidalization

Produktform: E-Buch Text Elektronisches Buch in proprietärem

The present monograph further develops the study, via the techniques of combinatorial anabelian geometry, of the profinite fundamental groups of associated to over algebraically closed fields of characteristic zero.The starting point of the theory of the present monograph is a result which allows one to reduce issues concerning the anabelian geometry of configuration spaces to issues concerning the anabelian geometry of hyperbolic curves, as well as to give of the of one-dimensional subquotients of the profinite fundamental group of a configuration space.We then turn to the study of , i.e., of the phenomenon that an outer automorphism of the profinite fundamental group of a log configuration space associated to a stable log curve induces the outer automorphism on certain subquotients of such a fundamental group determined by [i.e., copies of the projective line minus three points]. The theory of tripod synchronization shows that such outer automorphisms exhibit somewhat different behavior from the behavior that occurs in the case of discrete fundamental groups and, moreover, may be applied to obtain various strong results concerning .In the final portion of the monograph, we develop a theory of , on the dual graph of a stable log curve, for the condition that an outer automorphism of the profinite fundamental group of the stable log curve to an outer automorphism of the profinite fundamental group of a corresponding log configuration space. This localizability is combined with the theory of tripod synchronization to construct a purely combinatorial analogue of the natural outer surjection from the étale fundamental group of the moduli stack of hyperbolic curves over the field of rational numbers to the absolute Galois group of the field of rational numbers. weiterlesen

Dieser Artikel gehört zu den folgenden Serien

Elektronisches Format: PDF

Sprache(n): Englisch

ISBN: 978-9811910968 / 978-9811910968 / 9789811910968

Verlag: Springer Singapore

Erscheinungsdatum: 20.05.2022

Seiten: 150

Autor(en): Yuichiro Hoshi, Shinichi Mochizuki

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