I. Chifan

activity

20062026

most citedOn the structural theory of II_1 factors of negatively curved groups, II: Actions by product groups

55 citations · 354 across the 38 of their papers we have counts for

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3 papers · 1 filter

math.GR2012

Ergodic theorems for affine actions of amenable groups on Hilbert space

Ionut Chifan, Thomas Sinclair

We prove a new weak mean ergodic theorem (Theorem A) for 1-cocycles associated to weakly mixing representations of amenable groups. Let $G$ be a finitely generated, discrete, amena…

math.GR2009★ 18 cited

On Relative Property (T) and Haagerup's Property

Ionut Chifan, Adrian Ioana

We consider the following three properties for countable discrete groups $Γ$ : (1) $Γ$ has an infinite subgroup with relative property (T), (2) the group von Neumann algebra $L Γ$ ha…

math.GR2006

$C^{*}$ Estimates for Averaging Sums of Elements in the Thompson Group $F$

Ionut Chifan, Gabriel Picioroaga

In this paper we study the non-amenability question of the Thompson group $F$ from the $C^{*}$ algebra side. Using a characterization of amenability in this framework we set about…

Ergodic theorems for affine actions of amenable groups on Hilbert space

On Relative Property (T) and Haagerup's Property

C∗ Estimates for Averaging Sums of Elements in the Thompson Group F

$C^{*}$ Estimates for Averaging Sums of Elements in the Thompson Group $F$