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

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

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

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

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

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

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