This is a one-day mathematics conference held once or twice a year, usually in April in Omaha, Nebraska and in October in Des Moines, Iowa. The format consists of four hour-long talks, with a one-and-a-half or two hour lunch. between the 2nd and 3rd talk. The first talk typically starts at 11:00 am and the last talk finishes about 5:00 pm.

In Des Moines, we usually meet at The University of Iowa John and Mary Pappajohn Education Center, located at 1200 Grand Ave., Des Moines, IA 50309. Here is a map. (For many years, we met on the campus of Drake University, and we are grateful for their support.)

In Omaha, we usually meet on the campus of Creighton University.

The conference first met in March of 1994; the April 2014 meeting represented the twentieth year and the twenty-seventh meeting. (There have not been two meetings every year.)

It is jointly organized by the Mathematics Departments of Creighton University, Iowa State University, The University of Iowa, and The University of Nebraska-Lincoln. Faculty and students from a number of other nearby universities also attend. All are welcome. There is no registration fee. If you have any questions, please contact one of the organizers.

Randall Crist of Creighton

Raul Curto of Iowa

Yiu T Poon of Iowa State

Allan Donsig of Nebraska-Lincoln

When the meeting is scheduled and as speakers scheduled, the names, titles, and abstracts will be posted here.

Eric Weber (of Iowa State University)

*Title:* Vector-valued de Branges-Rovnyak spaces

*Abstract:* Model spaces are the subspaces of the Hardy space that are invariant under the back- ward shift and provide a replacement for the spectral theorem for the backward shift. General- izations of these subspaces are known as de Branges-Rovnyak spaces. De Branges introduced a vector valued version of these spaces via a generalization of the Herglotz representation for inner functions. I’ll discuss the construction as well as some of the scalar theory that passes to the vector case, and some of the scalar theory that doesn’t. These spaces arise in the construction of Fourier series expansions for fractal measures in dimensions 2 and above, and the fractal measures play a central role in the description of which parts of the scalar theory extends to the vector theory. This is joint work with John Herr and Palle Jorgensen.

Baruch Solel, (of the Technion, Haifa)

*Title:* Function Theory and W∗-Categories

*Abstract:* Free nc function theory is an extension of the theory of holomorphic functions of several complex variables to the theory of functions on matrix tuples Z = (Z-1,··· ,Z_d) where Z_i is an n by n complex matrix and n is allowed to vary.

An nc function is a function defined on such tuples Z and takes values in ∪n∈NMn(C) which is graded and respects direct sums and similarity (equivalently, respects intertwiners).

The classical correspondence between positive kernels and Hilbert spaces of functions has been recently extended by Ball, Marx and Vinnikov to nc completely positive kernels and Hilbert spaces of nc functions.

In a previous, unpulished work, we have developed a similar theory for matricial functions where C is replaced by a von Neumann algebra M, ∪n∈NMn(C) is replaced by a suitable disjoint union of correspondences over M and the “index set” N is replaced by the set of representations of M.

In this talk I will discuss a work in progress where we extend these results further to study functions (and kernels) that are invariant under certain actions of W∗-categories.

This is a joint work with Paul Muhly.

Paul Herstedt, (of Grinnell College)

*Title:* TBA

Ionut Chifan, (of the University of Iowa)

*Title:* Wreath-like product groups and their applications to the study of von Neumann algebras

*Abstract: *We will present several applications of wreath-like product groups to the structural theory of II_1 factors with property (T). Using quotienting techniques from geometric group theory, including Dehn filling, we will introduce a new class of wreath-like product groups which have peripheral structure. Exploiting this concept in combination with a new von Neumann algebraic reconstruction method we will show there exist uncountably many property (T) groups G which are completely recognizable from their von Neumann algebras, $L(G)$; in particular, they satisfy Connes Rigidity Conjecture. In addition, we will show that many of these groups are reconstructible from their reduced $C^*$ -algebras, $C^*_r (G)$ as well.

In a different direction, making use of the wreath-like product groups, we will prove that every separable tracial von Neumann algebra embeds into a $II_1$ factor with property (T) which can be taken to have trivial outer automorphism and fundamental groups.

This is based on a joint work with Adrian Ioana, Denis Osin and Bin Sun and a recent joint work with Daniel Drimbe and Adrian Ioana.

**November 3, 2018**Ruy Exel is visiting the University of Nebraska--Lincoln during the 2018-19 academic year. As part of his visit, he gave the 2018 Rowlee Lecture on Friday, November 2nd. On the following day, there was a one day research conference. For convenience, we post speakers, titles and slides here.- Ionut Chifan (the University of Iowa)

*Title:*Rigidity in group von Neumann algebras (slides)

Valentin Deaconu (the University of Nevada, Reno)

*Title:*Symmetries of Cuntz-Pimsner algebras (slides)

Ken Dykema (Texas A&M University)

*Title:*Schur-type upper triangular forms and decomposability in finite von Neumann algebras

Ruy Exel (University of Nebraska-Lincoln and Universidade Federal de Santa Catarina)

*Title:*Quasi-invariant measures for generalized approximately proper equivalence relations (slides)

Elizabeth Gillaspy (University of Montana) (slides)

*Title:*Generalized gauge actions, KMS states, and Hausdorff dimension for higher-rank graphs

Isaac Goldbring (University of California, Irvine)

*Title:*Embedding problems, games, and square roots (slides)

Jesse Peterson (Vanderbilt University)

*Title:*Properly proximal groups and their von Neumann algebras

**April 7, 2018**Sayan Das (University of Iowa)

*Title:*A remark on the ultrapower algebra of the hyperfinite factor

Zhuang Niu (University of Wyoming)

*Title:*The Classification of simple separable nuclear C^{*}-algebras

Sarah Reznikoff (of Kansas State University)

*Title:*Further analysis of the Cartan abelian core (slides)

Eric Weber (of Iowa State University)

*Title:*The Paley-Wiener theorem for singular measures (slides)

**November 11, 2017**Raul Curto (of the University of Iowa)

*Title:*Toral and spherical Aluthge transforms (slides)

Friedrich Littmann (of the North Dakota State University)

*Title:*Perfect band-limited reconstruction (slides)

Palle Jorgensen (of the University of Iowa)

*Title:*Representations of the Cuntz-algebras, some of their uses, and why they are important.

Lara Ismert (of the University of Nebraska-Lincoln)

*Title:*A weakly-defined derivation and stability of its kernels

Derek DeSantis (of the University of Nebraska-Lincoln)

*Title:*Operator algebras generated by a left invertible

**April 8, 2017**Roger Smith (of Texas A&M University)

*Title:*A Galois Correspondence for Crossed Products

*Abstract:*If a discrete group*G*acts on an operator algebra*A*(C^{*}or von Neumann) the question arises of whether the algebras between*A*and its crossed product by*G*can be characterized by subgroups of*G*. When*A*is a simple C^{*}-algebra and*G*acts by outer automorphisms, a positive answer has been given by Landstad-Olesen-Pedersen when*G*is abelian, by Choda (with some rather restrictive extra hypotheses) and by Izumi when*G*is finite. In this talk I will give a positive solution for all discrete groups*G*and discuss some consequences. This is joint work with Jan Cameron.

Daniel Freeman (of St. Louis University)

*Title:*The Discretization Problem for Continuous Frames

*Abstract:*Functions on*L*([0, 1]) can be analyzed continuously through the Fourier transform, or discretely through Fourier series and sampling the Fourier transform only at the integers. The discretization problem essentially asks what other continuous representations can be sampled to obtain discrete representations. We solve this problem by giving a complete characterization of when a continuous frame for a Hilbert space may be sampled to obtain a discrete frame. In particular, every bounded continuous frame may be sampled to obtain a discrete frame. This is joint work with Darrin Speegle.^{2}

Gabriel Nagy (of Kansas State University)

*Title:*Essential inclusions revisited - preliminary report

*Abstract:*Call a C^{*}-algebra inclusion*A*⊂*B essential*, if there is no non-trivial closed two sided ideal*J*⊂*B*, such that*J*∩*A*is empty. Over the past five years or so (joint works with Brown, Reznikoff, Sims and Williams), most examples of such inclusions were produced by investigating the space of states on*A*that extend uniquely to states on*B*. I will try to explain why conceptually (but not literally!), this is the only technique that works, if it is suitably adapted to the case when the above mentioned state space is rather small (or even empty!). As an application, we provide a simplicity criterion for reduced C^{*}-algebras of etale groupoids. (Joint work with Danny Crytser)

Lance Nielsen (of Creighton University)

*Title:*Feynman's Operational Calculus: Introduction and Essential Properties

*Abstract:*After some background and history related to Feynmanâ€™s development of his operational calculus, the Jefferies-Johnson approach to the operational calculus will be introduced. We will then survey some important results and applications of the operational calculus, including a look at stability properties as well as evolution/generalized integral equations satisfied by the operational calculus.

**November 5, 2016**Gordon Aiello (of University of Iowa)

*Title:*Euclidean Scattering and the Problem of Moments (slides)

Calvin Hotchkiss (of Iowa State University)

*Title:*Fourier Bases on the "Skewed Sierpinski Gasket" (slides)

Paul Muhly (of University of Iowa)

*Title:*Operator Algebras as Algebras of Functions (slides)

*Abstract:*Suppose*R*and*S*are two unital rings and let*X*be the space of all unital homomorphisms of*R*to*S*. Of course,*X*may be empty, but under favorable conditions,*X*can be rich and then*R*can be represented as a ring of*S*-valued functions on*X: r -> r*, where*r (p) := p(r), p in X*. One can then turn her attention to studying the functions and investigating information they reveal about*R*. This may sound familiar - perhaps as some sort of generalized Gelfand theory. In a sense, it is. However, the first thing I want to do is to show that Gelfand was nearly 60 years late to the party. This point of view arose long before Gelfand. I then want to show how the perspective plays an important role in the noncommutative function theory that arises in free analysis and in Baruch Solel's and my work on tensor operator algebras. The operator algebras involved may be represented as algebras of bonafide operator-valued, analytic functions with remarkable properties. That is, the operator algebras are repreented as noncommutative function algebras. These, in turn, prove to be a fertile environment in which to apply Arveson's theory of subalgebras of*C*-algebras.^{*}

David Pitts (of University of Nebraska-Lincoln)

*Title:*Unique Pseudo-Expectations, Dynamics, and Minimal Norms (slides)

Yiu Tung Poon (of Iowa State University)

*Title:*Compression, Matrix Range and Completely Positive Map (slides)

**April 30, 2016**Sergei Bezuglyi (of University of Iowa)

*Title:*Harmonic functions on Bratteli diagrams (slides)

Jon Brown (of University of Dayton)

*Title:*A ``Weyl type'' groupoid for Leavitt path algebas

*Abstract:*Given a Cartan subalgebra A of C^{*}-algebra B, Renault (2008) constructed a topologically principal groupoid whose reduced groupoid C^{*}-algebra is isomorphic to B and where the isomorphism restricts to an isomorphism of the canonical Cartan subalgebra of C_r^{*}(G) to A. However there are many interesting examples abelian subalgebras of a given C^{*}-algebra that are not Cartan; for example given a directed graph E that doesn't satisfy condition L, the subalgebra D(E) generated by the range and source projections of paths in a graph algebra C^{*}(E). Recently, Brownlowe, Carlsen and Whittaker constructed a ``Weyl type'' groupoid for this inclusion: importantly their construction relies only on the algebra and not the graph itself. They showed that this Weyl groupoid is isomorphic to the graph groupoid and thus an isomorphism from C^{*}(E) to C^{*}(F) that is ``diagonal preserving'' in the sense that it restricts to an isomorphism of D(E) to D(F) gives an isomorphism of the graph groupoids. In this talk, I present joint work with Clark and an Huef, which follows Brownlowe et al to construct a Weyl groupoid for Leavitt path algebra. We use this construction to prove that for ``diagonal preserving'' *-ring isomorphisms of Leavitt path algebras, the resulting C^{*}-algebras must also be isomorphic: proving a special cases of the Abrams-Tomforde isomorphism conjecture.

Rolando de Santiago (of University of Iowa)

*Title:*Product rigidity for the von Neumann algebras of hyperbolic groups (slides)

Rachel Norton (of University of Iowa)

*Title:*Comparing Two Generalized Nevanlinna-Pick Theorems (slides)

Eric Weber (of Iowa State University)

*Title:*Fourier and Harmonic Analysis of Measures (slides)

**March 28, 2015**(the first meeting at Creighton University in Omaha)

Danny Cryster (of Kansas State University)

*Title:*The abelian core and the trace space of a graph algebra (slides)

*Abstract:*The abelian core of a graph algebra is a MASA which has nice state-extension properties. The spectrum of the abelian core encodes information about the pure states of the graph algebra. We describe the trace space of a graph algebra as the set of measures on this spectrum which satisfy a certain natural covariance condition. Joint work with Gabriel Nagy.

Jennifer Good (of University of Iowa)

*Title:*Toward a complete Pick Property in a*W*-Setting (slides)^{*}

Sarah Reznikoff (of Kansas State University)

*Title:*Graph, k-Graph, and Groupoid C*-algebras (cancelled) (slides)

Jason Ekstrand (of Iowa State University)

*Title:*Positivity in Function Algebras (slides)

Travis Russell (of University of Nebraska---Lincoln)

*Title:*Order Bounded Maps and Operator Spaces (slides)

**October 19, 2014**.

John Haussermann (of University of Central Florida)

*Title:*On Spectra of a Cantor Measure (slides)

Adam Fuller (of University of Nebraska---Lincoln)

*Title:*Von Neumann Algebras and Extensions of Inverse Semigroups (slides)

*Abstract:*In the 1970s, Feldman and Moore classified separably acting von Neumann algebras contain ing Cartan MASAs using measured equivalence relations and 2-cocycles on such equivalence relations. In this paper, we give a new classification in terms of extensions of inverse semigroups. By avoiding most measure theory, our approach is simpler, and allows for the classification of all Cartan pairs, even those which do not act separably. Our approach is more algebraic in character and less point-based than that of Feldman-Moore.

Chris Schafhauser (of University of Nebraska---Lincoln)

*Title:*AF-Embeddings of Graph Algebra (slides)

*Abstract:*In the late 1990's, Blackadar and Kirchberg asked if every separable, nuclear, stably finite*C**-algebra can be embedded into an AF-algebra. We will discuss this conjecture for the class of graph*C**-algebras and Cuntz-Pimsner algebras. In particular, if either that*E*is a discrete graph or that*E*is a compact topological graph with no sinks and*C*(E)*is finite, then*C*(E)*is AF-embeddable. Also if*E*is a totally disconnected topological quiver and*C*(E)*is stable finite, then*C*(E)*is AF-Embeddable.

Baruch Solel (of Technion, Israel)

*Title:*Matricial Families and Weighted Shifts (slides)

**April 19, 2014**.

Robert Pluta (of University of Iowa)

*Title:*Corners of C*-algebras (slides)

Philip Gipson (of University of Nebraska)

*Title:*The Invariant Basis Number Property for C*-Algebras (slides)

Jon Brown (of Kansas State University)

*Title:*Purely infinite simple C*-algebras associated to etale groupoids (slides)

*Abstract:*Let*G*be a Hausdorff, etale groupoid that is minimal and topologically principal. In this talk, we reduce the problem of checking if C^{*}_{r}(*G*) is purely infinite to checking that elements of C_{0}(*G*^{(0)}) are infinite in C^{*}_{r}(*G*). In particular, we show that C^{*}_{r}(*G*) is purely infinite simple if and only if all the nonzero positive elements of C_{0}(*G*^{(0)}) are infinite in C^{*}_{r}(*G*). If*G*is also ample, then we show that C^{*}_{r}(*G*) is purely infinite simple if and only if every nonzero projection in C_{0}(*G*^{(0)}) is infinite in C^{*}_{r}(*G*). We then show how this result applies to*k*-graph C*-algebras. This work is joint with Lisa Clark and Adam Sierakowski.

Dima Kaliuzhnyi-Verbovetskyi (of Drexel University)

*Title:*Free Noncommutative Functions: An Introduction (slides)

*Abstract:*This talk is intended to be a brief introduction to noncommutative function theory that derives from the free algebra in the same sense that ordinary analytic functions may be derived from the polynomial algebra. The fundamental difference is that in the theory of polynomials and ordinary analytic functions, a polynomial determines a single function of one or more variables, depending on where one starts. However, in the theory I will be discussing, an element in the free algebra determines a whole sequence of functions, each one of which is matrix-valued. The problem is to understand how all these sequences fit together and to base a general theory upon them. This idea originated in the work of Joe Taylor in the early 1970s. It lay fallow for some years, and only recently has exploded into a full-fledged theory. This talk is intended to give an introduction to the theory, which is exposed in detail in my soon-to-be published book with Victor Vinnikov, Foundations of Noncommutative Function Theory.

**November 9, 2013**.

Sergli Berzuglyi (of University of Iowa)

*Title:*Full groups of transformations in measurable, Borel, and Cantor dynamics

Michael Hartglass (of University of Iowa)

*Title:*Planar Algebras and thier graded structure

Matthew Kennedy (of Carleton University)

*Title:*The Choquet boundary of an Operator System (slides)

*Abstract:*In this talk, I will discuss the recent solution (with Ken Davidson) of Arveson's conjecture on the existence of the noncommutative Choquet boundary of an operator system. This is an intrinsic invariant of an operator system that plays a fundamental role in Arveson's approach to the study of non-commutative dilation theory and non-self-adjoint operator algebras. I will also mention some recent work (with Orr Shalit) connecting these ideas to the essential normality of a commuting tuple.

Gabriel Picioroaga (of University of South Dakota)

*Title:*Cuntz algebras, generalized Walsh bases, and applications (slides)

**Spring 2013**.

There was a very nice AMS special session at the AMS regional meeting at Iowa State.

**November 3, 2012**.

Sa'ud Al-Sa'Di (of Iowa State University)

*Title:*Sampling and interpolation in Hilbert spaces of entire functions

Jeff Blanchard (of Grinnel College)

*Title:*Greedy Algorithms in Compressed Sensing: Theory and Software

Adam Fuller (of University of Nebraska at Lincoln)

*Title:*Nonself-adjoint 2-graph algebras

Palle Jorgensen (of the University of Iowa)

*Title:*An instance of spectrum vs geometry: The universal tiling conjecture

**April 14, 2012**.

Allan Donsig (of University of Nebraska at Lincoln)

*Title:*Tight Representations and Inverse Semigroups (slides)

David Milan (of University of Texas at Tyler)

*Title:*Crossed Product Results for Inverse Semigroup C*-algebras (slides)

Andrew Greene (of University of Iowa)

*Title:*Extensions of Hilbert Modules over Tensor Algebras (slides)

Woo Young Lee (of Seoul National University)

*Title:*Hyponormality of block Toeplitz operators

Anchalee Khemphet (of Iowa State University)

*Title:*The Jacobson radical of semicrossed products of the disk algebra (slides)

Dominic Kramer (of Iowa State University)

*Title:*Basis Identification through Convex Optimization

**October 14-16, 2011**.

The fall 2011 meeting was held jointly with the AMS regional meeting in Lincoln. There were several relevant special sessions:**November 6-7, 2010**.

The fall 2010 meeting was held jointly with Groupoidfest 2010. It is scheduled for November 6 - 7, 2010 at Creighton University in Omaha. For more information, see the Groupoidfest 2010 website.

**April 17, 2010**.

Nikolai Vasilevski, (of CINVESTAV (Mexico) and Princeton Univ.)

*Title:*Commutative algebras of Toeplitz operators in action (slides)

Lawrence Fialkow, (of SUNY at New Paltz)

*Title:*The role of "positivity" in moment and polynomial optimization problems (slides)

Paulette Willis, (of Univ. of Iowa)

*Title:*Labeled graph C*-algebras with group actions (slides)

Florian-Horia Vasilescu, (of Univ. de Lille and Univ. of Iowa)

*Title:*Truncated Moment Problems via Riesz Functionals

**November 15, 2009**.

Yiu Poon (of Iowa State University)

*Title:*Completely Positive Maps in Quantum Information (slides)

David Pitts (of the University of Nebraska-Lincoln)

*Title:*Embeddings and the D-radical of an Inclusion

Lance Nielsen (of Creighton University)

*Title:*Feynman's Operational Calculi : Background and a Survey of Current Research (slides)

**April 25, 2009**.

Dennis Courtney (of the University of Iowa)

*Title:*Exact constants in dilation theory (slides)

Martha Gregg (of Augustana University)

*Title:*C*-Extreme Points of the Generalized State Space of a Commutative C*-Algebra (slides)

Sam Schmidt (of the University of Iowa)

*Title:*Endomorphisms, The Toeplitz Algebra, and Complication Operators (slides)

**April 12, 2008**.

Victor Kaftal (of the University of Cinncinati)

*Title:*Diagonals of positive operators

Valentin Matache (of University of Nebraska at Omaha)

*Title:*Some problems in functional operator theory exhibiting a nice interplay between operator theory and function theory

Yiu Poon (of Iowa State University)

*Title:*Rank*k*numerical range in quantum information

Erin Pearse (of the University of Iowa)

*Title:*Operator theory of electrical resistance networks

**April 1, 2006**.

Ken Davidson (of the University of Waterloo; visiting Nebraska)

*Title:*Isomorphisms of topological conjugacy algebras

Doug Farenick (of the University of Regina)

*Title:*Injective envelopes and local multipliers of C*-algebras

Palle Jorgensen (of the University of Iowa)

*Title:*From signals to operator theory to wavelets

**October, 2005**

There was no meeting. Instead, people went to one or both of the American Mathematical Society Regional Meeting or Groupoidfest 2005.- The AMS regional meeting is in Lincoln, NE on October 21-23.
- Groupoidfest 2005 is at Iowa State University on November 5-6.

**April 23, 2005**Stefan Bildea (of the University of Iowa)

*Title:*Freeness and Cost in the context of triangle amalgams of C*-algebras and measurable equivalence relations

John Orr (of the University of Nebraska-Lincoln)

*Title:*Classifying stable ideals of nest algebras

Jasang Yoon (of Iowa State University)

*Title:*Subnormality of Bergman-like weighted shifts

**October 30, 2004**Steve Kaliszewski (of Arizona State University; visiting The University of Iowa).

*Title:*Symmetric Imprimitivity Theorems and `Hash Products'

Alex Kumjian (of The University of Nevada, Reno)

*Title:*Actions of**Z**associated to higher rank graphs^{k}

V.S. Sunder (of The Institute of Mathematical Sciences, Chennai, India; visiting The University of Iowa).

*Title:*A complete family of numerical invariants for a subfactor.

Eric Weber (of Iowa State University)

*Title:*Group Representations and Wavelet Transforms

**April, 2004**There is no meeting. Instead, go to the CBMS conference by Iain Raeburn on Graph Algebras: Operator Algebras We Can See, from May 31 to June 4, 2004.

**October 11, 2003**Lawrence Fialkow (of SUNY at New Paltz)

*Title:*Solution to truncated and full moment problems on planar curves of degree 2

Paul Muhly (of the University of Iowa)

*Title:*Function Theory from Tensor Algebras

Jean Renault (of UniversitÃ© d'OrlÃ©ans)

*Title:*AP Groupoids

Ryan Zerr (of the University of North Dakota)

*Title:*Characterizing and studying AF C*-algebras

**April 12, 2003**Valentin Matache (of University of Nebraska at Omaha)

*Title:*Complex Dynamics and Composition Operators

Lance Nielsen (of Creighton University)

*Title:*A Survey of Feynman's Operational Calculus

Konrad Schmuedgen (of Universitat Leipzig)

*Title:*A polar decomposition for holomorphic functions on a strip

David Pitts (of the University of Nebraska-Lincoln)

*Title:*Automorphisms and Coordinates for Triangular Algebras

**October 19, 2002**Baruch Solel (of the Technion, Israel)

*Title:*The Curvature and Index for Completely Postive Maps

Jack Spielberg (of Arizona State Univ.)

*Title:*Generalized graphs and semiprojective C*-algebras

Alan Hopenwasser (of Univ. of Alabama-Tuscaloosa)

*Title:*Subalgebras of Cuntz C*-algebras

Mark Tomforde (of University of Iowa)

*Title:*Gauge-Invariant Uniqueness for Relative Cuntz-Pimsner Algebras

**April 13, 2002**Andu Nica (of Waterloo)

*Title:*R-cyclic families of matrices in free probability

David Larson (of Texas A & M)

*Title:*Frames, Wavelets and Operator Theory

Eric Weber (of Texas A & M)

*Title:*The Geometry of Affine Frames

Palle Jorgensen (of University of Iowa)

*Title:*Wavelets, operators, and algorithms: two kinds!

**October 13, 2001**Elias Katsoulis (of East Carolina University)

*Title:*Representations for Operator Algebras and Applications to their Facial Structure

Serban Stratila (of University of Iowa)

*Title:*The Commutation Theorem for Tensor Products of Operator Algebras over Subalgebras

Devin Greene (of University of Nebraska at Lincoln)

*Title:*Free Resolutions in Multivariable Operator Theory

Dorin Dutkay (of University of Iowa)

*Title:*The Wavelet Galerkin Operator

**April 13, 2001**

A special meeting was held in Lincoln, in connection with V.F.R. Jones's Rowlee Lecture.

**October 14, 2000**Maria Tjani (of University of Arkansas)

*Title:*Compact composition operators on some subspaces of the Bloch space

Wolfgang Kliemann (of Iowa State University)

*Title:*Spectra of Flows on Vector Bundles

Srdjan Petrovic (of Western Michigan University)

*Title:*On the \lambda-commutativity of Volterra operators

David Kribs (of University of Iowa)

*Title:*Dilation theory and Cuntz representations

**April 22, 2000**Lawrence Fialkow (of SUNY at New Paltz)

*Title:*The quartic moment problem

David Pitts (of University of Nebraska--Lincoln)

*Title:*Invariants for Triangular Limit Algebras under Algebraic Isomorphisms

Jacqui Ramagge (of University of Newcastle, Australia)

*Title:*Haagerup bounds: Results and conjectures

David Pask (of University of Newcastle, Australia)

*Title:*The ideal structure of graph C*-algebras

**October 30, 1999**Stephen Power (of Lancaster University, U.K.)

*Title:*Classifying limits of Finite Dimensional Algebras

Sergei Silvestrov (of University of Iowa)

*Title:*Bounded and unbounded operator representations of generalised Lie algebras and their deformations

Valentin Matache (of University of Nebraska at Omaha)

*Title:*Numerical Ranges, Composition Operators, and Computer Assisted Analysis

N. Diep (of University of Iowa)

*Title:*A Survey of Noncommutative Chern Characters

**April 17, 1999**V. S. Sunder (of Institute of Mathematical Sciences, Madras, India)

*Title:*From Ergodic Theory to Subfactors

Terje Sund (of University of Oslo)

*Title:*Groups with Trivial Cortex

Victor Kaftal (of University of Cincinnati)

*Title:*Regular sequences, operator ideals, commutators and traces

Liming Ge (of University of New Hampshire)

*Title:*Matrix Models, Free Entropy and Factors of type II_1

**October 17, 1998**

Gary Weiss (of University of Cinncinnati) Madras, India)

*Title:* The commutator structure of operator ideals and unitarily invariant trace extensions beyond the trace class

Michael Lamourexu (of University of Calgary)

*Title:* Ideals in Continuous Crossed products

Paul Muhly (of University of Iowa)

*Title:* On the Morita equivalence of C*-correspondences

Roger Smith (of Texas A&M University)

*Title:* Cohomology of von Neumann algebras with Cartan subalgebras

**October 11, 1997**

May Nilsen (of the University of Nebraska-Lincoln)

*Title:* Hopf C*-algebras

Randall Crist (of Creighton University)

*Title:* Derivations on TAF Algebras

Nik Weaver (of Washington University in St. Louis)

*Title:* Metrics from the Point of View of Functional Analysis)

Radu Gologan (of the University of Iowa and the Institute of Mathematics of Romanian Academy of Sciences)

*Title:* Pointwise Ergodic Theorems

**April 26, 1997**

Teresa Bermudez (of the University of Iowa and University de Laguana, Spain)

*Title:* Some Results in Local Spectral Theory

Dale Buske (of Iowa State University and St. Cloud State University)

*Title:* Hilbert Modules over a class of Semicrossed Products

Bryan Cain (of Iowa State University)

*Title:* Operator Equations, Inertia, and Stability

Eui-Chai Jeong (of the University of Iowa)

*Title:* Decomposition of the Cuntz Algebra Representation