#### Important information regarding the recent AMS power outage.

The transformer that provides electricity to the AMS building in Providence went down on Sunday, April 22. The restoration of our email, website, AMS Bookstore and other systems is almost complete. We are currently running on a generator but overnight a new transformer should be hooked up and (fingers crossed) we should be fine by 8:00 (EDT) Wednesday morning. This issue has affected selected phones, which should be repaired by the end of today. No email was lost, although the accumulated messages are only just now being delivered so you should expect some delay.

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# Memoirs of the American Mathematical Society

The Memoirs of the AMS series is devoted to the publication of research in all areas of pure and applied mathematics. The Memoirs is designed particularly to publish long papers or groups of cognate papers in book form, and is under the supervision of the Editorial Committee of the AMS journal Transactions of the AMS.

View other years and numbers:

### Volume 250

Number Title
MEMO/1193 Medial/Skeletal Linking Structures for Multi-Region Configurations - James Damon and Ellen Gasparovic
MEMO/1192 Maximal abelian sets of roots - R. Lawther
MEMO/1191 Knot invariants and higher representation theory - Ben Webster
MEMO/1190 The Planar Cubic Cayley Graphs - Agelos Georgakopoulos
MEMO/1189 The Stability of Cylindrical Pendant Drops - John McCuan
MEMO/1188 Entire solutions for bistable lattice differential equations with obstacles - A. Hoffman, H. J. Hupkes and E. S. Van Vleck

### Volume 249

Number Title
MEMO/1187 Induction, Bounding, Weak Combinatorial Principles, and the Homogeneous Model Theorem - Denis R. Hirschfeldt, Karen Lange and Richard A. Shore
MEMO/1186 Property $(T)$ for Groups Graded by Root Systems - Mikhail Ershov, Andrei Jaikin-Zapirain and Martin Kassabov
MEMO/1185 Absolute Continuity under Time Shift of Trajectories and Related Stochastic Calculus - Jörg-Uwe Löbus
MEMO/1184 On operads, bimodules and analytic functors - Nicola Gambino and André Joyal
MEMO/1183 Hypercontractivity in group von Neumann algebras - Marius Junge, Carlos Palazuelos, Javier Parcet and Mathilde Perrin
MEMO/1182 Fundamental solutions and local solvability for nonsmooth Hörmander’s operators - Marco Bramanti, Luca Brandolini, Maria Manfredini and Marco Pedroni
MEMO/1181 Optimal Regularity and the Free Boundaryin the Parabolic Signorini Problem - Donatella Danielli, Nicola Garofalo, Arshak Petrosyan and Tung To
MEMO/1180 Needle Decompositions in Riemannian Geometry - Bo’az Klartag

### Volume 248

Number Title
MEMO/1179 Applications of Polyfold Theory I: The Polyfolds of Gromov–Witten Theory - H. Hofer, K. Wysocki and E. Zehnder
MEMO/1178 Maximal Cohen–Macaulay Modules Over Non–Isolated Surface Singularities and Matrix Problems - Igor Burban and Yuriy Drozd
MEMO/1177 Special Values of the Hypergeometric Series - Akihito Ebisu
MEMO/1176 Rationality Problem for Algebraic Tori - Akinari Hoshi and Aiichi Yamasaki
MEMO/1175 Locally analytic vectors in representations of locally $p$-adic analytic groups - Matthew Emerton

### Volume 247

Number Title
MEMO/1174 The Mathematics of Superoscillations - Yakir Aharonov, Fabrizio Colombo, Irene Sabadini, Daniele C. Struppa and Jeff Tollaksen
MEMO/1173 Topologically Protected States in One-Dimensional Systems - C. L. Fefferman, J. P. Lee-Thorp and M. I. Weinstein
MEMO/1172 Homology of Normal Chains and Cohomology of Charges - Th. De Pauw, R. M. Hardt and W. F. Pfeffer
MEMO/1171 Intersection Local Times, Loop Soups and Permanental Wick Powers - Yves Le Jan, Michael B. Marcus and Jay Rosen
MEMO/1170 Direct and inverse scattering at fixed energy for massless charged Dirac fields by Kerr-Newman-de Sitter black holes - Thierry Daudé and François Nicoleau
MEMO/1169 Quantum cluster algebra structures on quantum nilpotent algebras - K. R. Goodearl and M. T. Yakimov
MEMO/1168 Semicrossed products of operator algebras by semigroups - Kenneth R. Davidson, Adam H. Fuller and Evgenios T. A. Kakariadis

### Volume 246

Number Title
MEMO/1167 Birationally rigid Fano threefold hypersurfaces - Ivan Cheltsov and Jihun Park
MEMO/1166 New foundations for geometry: Two non-additive languages for arithmetical geometry - M. J. Shai Haran
MEMO/1165 Exotic cluster structures on $SL_n$: the Cremmer–Gervais case - M. Gekhtman, M. Shapiro and A. Vainshtein
MEMO/1164 Oseledec multiplicative ergodic theorem for laminations - Viêt-Anh Nguyên
MEMO/1163 On Dwork’s $p$-adic formal congruences theorem and hypergeometric mirror maps - E. Delaygue, T. Rivoal and J. Roques
MEMO/1162 Abelian Properties of Anick Spaces - Brayton Gray

### Volume 245

Number Title
MEMO/1161 The Role of Advection in a Two-Species Competition Model: A Bifurcation Approach - Isabel Averill, King-Yeung Lam and Yuan Lou
MEMO/1160 Classification of actions of discrete Kac algebras on injective factors - Toshihiko Masuda and Reiji Tomatsu
MEMO/1159 $L^p$-square function estimates on spaces of homogeneous type and on uniformly rectifiable sets - Steve Hofmann, Dorina Mitrea, Marius Mitrea and Andrew J. Morris
MEMO/1158 Rectifiable measures, square functions involving densities, and the Cauchy transform - Xavier Tolsa
MEMO/1157 Imaginary Schur-Weyl duality - Alexander Kleshchev and Robert Muth
MEMO/1156 Hyperbolically embedded subgroups and rotating families in groups acting on hyperbolic spaces - F. Dahmani, V. Guirardel and D. Osin