By Umberto Zannier,David Masser

This e-book considers the so-called not going Intersections, an issue that embraces famous matters, akin to Lang's and Manin-Mumford's, referring to torsion issues in subvarieties of tori or abelian forms. extra in general, the ebook considers algebraic subgroups that meet a given subvariety in a suite of unlikely size. The e-book is a diffusion of the Hermann Weyl Lectures added by way of Umberto Zannier on the Institute for complicated learn in Princeton in may perhaps 2010.

The publication involves 4 chapters and 7 short appendixes, the final six via David Masser. the 1st bankruptcy considers multiplicative algebraic teams, offering proofs of a number of advancements, starting from the origins to fresh effects, and discussing many purposes and family with different contexts. the second one bankruptcy considers an analogue in mathematics and several other purposes of this. The 3rd bankruptcy introduces a brand new process for drawing close a few of these questions, and offers a close software of this (by Masser and the writer) to a relative case of the Manin-Mumford factor. The fourth bankruptcy makes a speciality of the André-Oort conjecture (outlining paintings by means of Pila).

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