JournalsggdVol. 5, No. 2Groups, Geometry, and DynamicsVolume 5, Number 2, 2011DOI: 10.4171/ggd | ISSN: 1661-7207 | eISSN: 1661-7215Editorialpp. 207–211The rank gradient from a combinatorial viewpointMiklós AbértAndrei Jaikin-ZapirainNikolay Nikolovpp. 213–230The moduli space of Keum–Naie surfacesIngrid BauerFabrizio Catanesepp. 231–250Lattices with and lattices without spectral gapBachir BekkaAlexander Lubotzkypp. 251–264Random pro-$p$ groups, braid groups, and random tame Galois groupsNigel BostonJordan S. Ellenbergpp. 265–280Suzuki groups as expandersEmmanuel BreuillardBen J. GreenTerence Taopp. 281–299On the difficulty of presenting finitely presentable groupsMartin R. BridsonHenry Wiltonpp. 301–325The congruence subgroup property for Aut $F_2$: A group-theoretic proof of Asada’s theoremKai-Uwe BuxMikhail ErshovAndrei S. Rapinchukpp. 327–353Mod-$p$ cohomology growth in $p$-adic analytic towers of 3-manifoldsFrank CalegariMatthew Emertonpp. 355–366On the Arthur–Selberg trace formula for GL(2)Tobias FinisErez Lapidpp. 367–391Interpolating coefficient systems and $p$-ordinary cohomology of arithmetic groupsGünter Harderpp. 393–444Subspace arrangements and property TMartin Kassabovpp. 445–477Grothendieck’s problem for 3-manifold groupsDarren D. LongAlan W. Reidpp. 479–499Powers in finite groupsNikolay NikolovDan Segalpp. 501–507Words and mixing times in finite simple groupsGili SchulAner Shalevpp. 509–527Geometric cycles, Albert algebras and related cohomology classes for arithmetic groupsJoachim Schwermerpp. 529–552Reduction theory of point clusters in projective spaceMichael Stollpp. 553–565

The rank gradient from a combinatorial viewpointMiklós AbértAndrei Jaikin-ZapirainNikolay Nikolovpp. 213–230

Random pro-$p$ groups, braid groups, and random tame Galois groupsNigel BostonJordan S. Ellenbergpp. 265–280

The congruence subgroup property for Aut $F_2$: A group-theoretic proof of Asada’s theoremKai-Uwe BuxMikhail ErshovAndrei S. Rapinchukpp. 327–353

Mod-$p$ cohomology growth in $p$-adic analytic towers of 3-manifoldsFrank CalegariMatthew Emertonpp. 355–366

Interpolating coefficient systems and $p$-ordinary cohomology of arithmetic groupsGünter Harderpp. 393–444

Geometric cycles, Albert algebras and related cohomology classes for arithmetic groupsJoachim Schwermerpp. 529–552