Preface ........................................................ ix
Some Diophantine applications of the theory of group expansion .. 1
Jean Bourgain
A brief introduction to approximate groups ..................... 23
Emmanuel Breuillard
Superstrong approximation for monodromy groups ................. 51
Jordan S. Ellenberg
The ubiquity of thin groups .................................... 73
Elena Fuchs
The orbital circle method ...................................... 93
Alex V. Kontorovich
Sieves in discrete groups, especially sparse .................. 107
Emmanuel Kowalski
How random are word maps? ..................................... 141
Michael Larsen
Constructing thin groups ...................................... 151
Darren Long and Alan W. Reid
Ergodic properties of the Burger-Roblin measure ............... 167
Amir Mohammadi
Harmonic analysis, ergodic theory and counting for thin
groups ........................................................ 179
Нее Oh
Generic elements in Zariski-dense subgroups and isospectral
locally symmetric spaces ...................................... 211
Gopal Prasad and Andrei Rapinchuk
Growth in linear groups ....................................... 253
László Pyber and Endre Szabó
Strong approximation for algebraic groups ..................... 269
Andrei Rapinchuk
Generic phenomena in groups: some answers and many questions .. 299
Igor Rivin
Affine sieve and expanders .................................... 325
Alireza Salehi Golsefidy
Notes on thin matrix groups ................................... 343
Peter Sarnak
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