6,138 research outputs found
Fixed point properties in the space of marked groups
We explain, following Gromov, how to produce uniform isometric actions of
groups starting from isometric actions without fixed point, using common
ultralimits techniques. This gives in particular a simple proof of a result by
Shalom: Kazhdan's property (T) defines an open subset in the space of marked
finitely generated groups.Comment: The only modification from previous version is section numbering, in
order to agree with the published versio
On p-rank representations
The p-rank of an algebraic curve X over an algebraically closed field k of
characteristic p>0 is the dimension of the first etale cohomology vector space
H^1(X,Z/pZ). We study the representations of finite groups G of automorphisms
of X induced on the base extension of this vector space to k, and obtain two
main results:
First, the sum of the nonprojective direct summands of the representation,
i.e. its core, is determined explicitly by local data given by the fixed point
structure of the group acting on the curve. As a corollary, we derive a
congruence formula for the p-rank.
Secondly, the multiplicities of the projective direct summands of quotient
curves, i.e. their Borne invariants, are calculated in terms of the Borne
invariants of the original curve and ramification data. In particular, this is
a generalization of both Nakajima's equivariant Deuring-Shafarevich formula and
a previous result of Borne in the case of free actions.Comment: 14 page
Wreath products with the integers, proper actions and Hilbert space compression
We prove that the properties of acting metrically properly on some space with
walls or some CAT(0) cube complex are closed by taking the wreath product with
\Z. We also give a lower bound for the (equivariant) Hilbert space compression
of H\wr\Z in terms of the (equivariant) Hilbert space compression of H.Comment: Minor correction
Strongly singular MASA's and mixing actions in finite von Neumann algebras
Let be a countable group and let be an infinite abelian
subgroup of . We prove that if the pair satisfies
some combinatorial condition called (SS), then the abelian subalgebra
is a singular MASA in which satisfies a weakly
mixing condition. If moreover it satisfies a stronger condition called (ST),
then it provides a singular MASA with a strictly stronger mixing property. We
describe families of examples of both types coming from free products, HNN
extentions and semidirect products, and in particular we exhibit examples of
singular MASA's that satisfy the weak mixing condition but not the strong
mixing one.Comment: Title updated, examples and references added. To appear in Ergod. Th.
& Dynam. Sys
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A reciprocity for symmetric algebras
The aim of this note is to show, that the reciprocity property of group algebras in [5, (11.5)] can be deduced from formal properties of symmetric algebras, as exposed in [1], for instance
Limits of Baumslag-Solitar groups and dimension estimates in the space of marked groups
We prove that the limits of Baumslag-Solitar groups which we previously
studied are non-linear hopfian C*-simple groups with infinitely many twisted
conjugacy classes. We exhibit infinite presentations for these groups, classify
them up to group isomorphism, describe their automorphisms and discuss the word
and conjugacy problems. Finally, we prove that the set of these groups has
non-zero Hausforff dimension in the space of marked groups on two generators.Comment: 30 pages, no figures, englis
The casein kinases Yck1p and Yck2p act in the secretory pathway, in part, by regulating the Rab exchange factor Sec2p.
Sec2p is a guanine nucleotide exchange factor that activates Sec4p, the final Rab GTPase of the yeast secretory pathway. Sec2p is recruited to secretory vesicles by the upstream Rab Ypt32p acting in concert with phosphatidylinositol-4-phosphate (PI(4)P). Sec2p also binds to the Sec4p effector Sec15p, yet Ypt32p and Sec15p compete against each other for binding to Sec2p. We report here that the redundant casein kinases Yck1p and Yck2p phosphorylate sites within the Ypt32p/Sec15p binding region and in doing so promote binding to Sec15p and inhibit binding to Ypt32p. We show that Yck2p binds to the autoinhibitory domain of Sec2p, adjacent to the PI(4)P binding site, and that addition of PI(4)P inhibits Sec2p phosphorylation by Yck2p. Loss of Yck1p and Yck2p function leads to accumulation of an intracellular pool of the secreted glucanase Bgl2p, as well as to accumulation of Golgi-related structures in the cytoplasm. We propose that Sec2p is phosphorylated after it has been recruited to secretory vesicles and the level of PI(4)P has been reduced. This promotes Sec2p function by stimulating its interaction with Sec15p. Finally, Sec2p is dephosphorylated very late in the exocytic reaction to facilitate recycling
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