NA Digest Sunday, January 28, 2007 Volume 07 : Issue 05

Today's Editor:
Tamara G. Kolda
Sandia National Labs

Submissions for NA Digest:

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Information via email about NA-NET:

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From: Wolfgang Bangerth <>
Date: Thu, 25 Jan 2007 14:02:44 -0600
Subject: Re: Fortran vs Matlab

In the same spirit as Tim Davis' enumeration a few weeks back of sparse direct
solver packages written in Fortran vs C/C++, let me also add a few data
points in other areas:

- In sparse linear algebra, the two acknowledged heavyweight Open Source
packages at this time are PETSc and Trilinos. The first is written in C, the
latter mostly in C++.

- Among the more widely used packages that support finite element computations
beyond a single application, I would count DiffPack, PLTMG, deal.II,
FreeFEM++, libmesh, OOFEM, in addition to many others of varying degree of
distribution and open sourceness that could be listed here. Of the ones
listed, only the oldest one (PLTMG) is written in Fortran, all others in
C++. As far as I know, the more modern and more general frameworks that
supersede individual application-specific codes written in the national labs
are also written in C++.

It may be true that there is a large amount of legacy code written in
Fortran out there. However, all the codes listed above also have several
100,000 lines of code and are in no way immature recent inventions. It
therefore seems to me that by teaching Fortran instead of a more modern
programming language, we prepare our students more for conservation of old
codes than for the more far sighted maintenance and creation of current
and future codes.

The issue of Matlab vs compiled languages is a separate one to which
others have already contributed.

Wolfgang Bangerth


From: Tim Davis <>
Date: Wed, 24 Jan 2007 07:12:41 -0500
Subject: Re: those poor indices (Fortran vs MATLAB discussion)

Regarding Louis Komzsik's comment about Fortran vs MATLAB, and the use of
indices: in my domain (sparse matrix algorithms) we use indices all the time.
There comes a point, however, when indices get in the way, and a higher level
of abstraction is critical.

For example, [L,U,p]=lu(A,'vector') or p=amd(A), both in MATLAB, return a
permutation vector p. For LU, A(p,:)=L*U is computed. This is an index-free
statement. Similarly, a FEM matrix should be considered a sum of cliques, not
as a collection of scalar ij's.

Inside, these codes are chock full of index computations. When I read (or
write) comments in code near where all these indices are flying around, I see
higher level objects being discussed ("compute the set union of clique a and
clique b", "traverse the path from i to e", etc). Scalar "ij" comments do not
abound, even though scalar ij's abound in the code.

I interpret the statement "indices rearing their ugly heads" as the common
problem of introducing scalar indices too early. At some point they are
needed (in thought, in teaching, and in code) but they should always be kept
at the highest level of abstraction possible.

"Think globally, act scalarly" ...


From: Robert van de Geijn <>
Date: Wed, 24 Jan 2007 07:51:40 -0600
Subject: Those poor physical and geometric quantities!

I have posted my response to "Those poor indices!", as well as the
related postings, at

Robert van de Geijn


From: "Tutuncu, Reha" <>
Date: Fri, 26 Jan 2007 10:00:46 -0500
Subject: New Book Announcement: Optimization Methods in Finance

Dear colleagues,

We are pleased to announce the publication of our book "Optimization Methods
in Finance" available from Cambridge University Press. Please see
for a table of contents and ordering instructions.

This book is intended as a textbook for Master's programs in financial
engineering, finance, or computational finance. Chapters of the book
alternate between optimization methods and financial models that employ these
methods. This structure allows the use of this book as a primary or secondary
text in upper level undergraduate or introductory graduate courses in
operations research, management science, and applied mathematics.

Best regards,

Gerard Cornuejols
Tepper School of Business, Carnegie Mellon University

Reha Tutuncu
Quantitative Investment Strategies, Goldman Sachs Asset Management


From: David Griffiths <>
Date: Fri, 26 Jan 2007 05:38:16 -0500
Subject: Dundee Biennial NA Conference, June 2007

Tuesday 26th June - Friday 29th June, 2007

The registration and abstract submission forms are now online and accessible at

This will be the last such meeting held at Dundee. It is intended that future
meetings in the series be organized and held at the University of Strathclyde.


Abstract Submission: May 18
Registration: June 8.

We have funds available to support the attendance of (primarily young)
participants who are unable to obtain financing through regular channels. We
have no formal procedure; informal queries should be made to the organizers
outlining the circumstances. We do not normally give support for travel.

David Griffiths
Alistair Watson
Conference Organizers


From: Raimondas Ciegis <>
Date: Wed, 24 Jan 2007 14:37:07 +0200 (EET)
Subject: MMA2007 (Int. Conference in Vilnius), May/Jun 2007

Second Announcement
12th International Conference Mathematical Modelling and Analysis
May 30 - June 2, 2007, Trakai, Lithuania

Conference organizers
The European Consortium for Mathematics in Industry (ECMI),
Vilnius Gediminas Technical University,
Institute of Mathematics and Informatics, Vilnius,
Vilnius University

The Conference focuses on various aspects of mathematical modelling and usage
of finite difference and finite element methods for numerical solution of
modern problems of science and engineering. It aims, in particular, at
fostering cooperation among practitioners and theoreticians in this
field. Another very important goal of the MMA meetings is to assist the
creation and maintenance of contacts between scientists from the West and the
East. The working language of the Conference is English.

The basic topics
* Analysis of numerical methods for solving problems of mathematical physics;
* Parallel algorithms and parallel computing;
* Application of numerical methods to engineering problems;
* Analysis of ODE and PDE problems and applications;
* Navier - Stokes equations and Computational Fluid Dynamics;
* Financial mathematics and mathematics in economics;
* Scientific computation

Conference web-site:

Abstracts and Proceedings

Authors are requested to send an abstract (1 page) before April 1, 2007.
Instructions and a style file for the preparation of the abstracts are
available at

Conference materials
The selected papers of the Conference will be published in Vol.13 of
"Mathematical Modelling and Analysis" (The Baltic Journal on Mathematical
Applications, Numerical Analysis and Differential Equations), All papers will be peer-reviewed.

The registration fee is 300 EUR and can be paid directly at the registration
desk. It includes the abstract volume, all local expenses (accommodation in
two bed rooms for three nights and three meals per day), conference dinner and
coffee breaks. Persons who wish accommodation in single rooms should pay the
registration fee 400 EUR. The fee for PhD students is 200 EUR (accommodation
in two bed rooms). The fee for accompanying persons is 150 EUR. It includes
the reception, conference dinner, social events and accommodation in two bed
rooms for three nights and three meals per day.

Abstracts: April 1, 2007
Notification of participation and reservation of accommodation: May 1, 2007

Correspondence address
dr. A. Stikonas (MMA2007),
Dep. of Mathematical Modelling,
Vilnius Gediminas Technical University,
Sauletekio al. 11, LT-10223,Vilnius, Lithuania
Tel. (+370) 52744827, (+370) 52109734
Fax: (+370) 52729209

Questions regarding MMA2007 should be addressed to e-mail:


From: Bruce Boghosian <>
Date: Mon, 22 Jan 2007 21:09:52 -0500
Subject: 16th Intl Conf on the Discrete Simulation of Fluid Dynamics, July 2007

The 16th International Conference on the Discrete Simulation of Fluid
Dynamics (DSFD 2007): Micro, Nano and Multiphysics for Emerging
Technologies Conference will be held in Banff, Alberta, in the
Canadian Rockies, between July 23 - 27, 2007. More details about the
conference and Banff can be found in the conference web site:

Topics covered at the DSFD series of meetings include lattice gas
automata, the lattice Boltzmann equation, dissipative particle
dynamics, smoothed-particle hydrodynamics, direct simulation Monte
Carlo, stochastic rotation dynamics, molecular dynamics, and hybrid
methods. There will be sessions on advances in both theory and
computation, on engineering applications of discrete fluid
algorithms, and on fundamental issues in statistical mechanics,
kinetic theory, and hydrodynamics and their applications in Micro,
Nano and Multiscale Physics for emerging technologies. Other topics
of interest also include experimental work on interfacial phenomena,
droplets, free-surface flow, micro and nanofluidics. The deadline
for submission of abstracts is March 26, 2007.

As a participant, you will experience not only the conference but
also Banff itself. Attendees, companions, and families will be able
to tour historic sites, soak in hot springs, stroll scenic paths, and
visit the majestic Banff Springs Hotel.

Local Organizing Committee Chair:
Daniel Kwok, University of Calgary

Pacific Institute for Mathematical Sciences
Schulich School of Enginnering
Harvard Apparatus Canada

Bruce M. Boghosian
(Member, DSFD 2007 International Organizing Committee)
Professor and Chair, Department of Mathematics
Tufts University, Medford, Massachusetts 02155, USA


From: Marcin Paprzycki <>
Date: Mon, 22 Jan 2007 00:34:50 +0100
Subject: LaSCoG 3rd Workshop on Large Scale Computations on Grids, Sept 2007


3rd Workshop on Large Scale Computations on Grids
Gdansk, POLAND,
September 9-12, 2007

Large Scale Computations on Grids (LaSCoG) Workshop will be held in
conjunction with the Seventh International Conference on Parallel
Processing and Applied Mathematics (PPAM 2007,

The emerging paradigm for execution of large-scale computations, whether
they originate as scientific or engineering applications, or for
supporting large data-intensive calculations, is to utilize multiple
computers at sites distributed across the Internet. In particular,
computational grids are collections of distributed, possibly
heterogeneous resources which can be used as ensembles to execute
large-scale applications. While the vision of the global computational
grid is extremely appealing, there remains a lot of work on all levels
to achieve it. In this context the LaSCoG workshop is envisioned as a
forum to promote exchange of ideas and results aimed at addressing
complex issues that arise in developing large-scale computations on
grids and running applications on them.

Covered topics include (but are not limited to) grid-focused aspects of:
* Large-scale algorithms
* Symbolic and numeric computations
* High performance computations for large scale simulations
* Large-scale distributed computations
* Agent-based computing
* Data models for large-scale applications
* Security issues for large-scale computations
* Science portals
* Data visualization
* Performance analysis, evaluation and prediction
* Programming models
* Peer-to-peer models and services for scalable grids
* Collaborative science applications
* Business applications

Paper submission and publication:
* Papers will be refereed and accepted on the basis of their scientific
merit and relevance to the Workshop topics.
* Papers presented at the Workshop will be included in the Conference
Proceedings and published after the conference by Springer in the LNCS
series (
* Authors should submit papers (as PDF files) by e-mail to Dana Petcu
( before April 30, 2007.
* Papers are not to exceed 8 pages and have to be prepared using LNCS
style (
* Extended versions of selected papers will be published in a special
issue of a journal (to be announced later).

Important dates:
Submission of Papers: April 30, 2007
Notification of Acceptance: June 15, 2007
Conference: September 9, 2007
Camera-Ready Papers: October 15, 2007


From: Dongming Wang <>
Date: Thu, 25 Jan 2007 10:17:33 +0100
Subject: AWFS 2007 Call for Participation, June 2007

AWFS 2007
Fifth Asian Workshop on Foundations of Software
Xiamen, China, June 1-3, 2007

Asian Workshop on Foundations of Software (AWFS) addresses foundational
problems in current and future software design, development, and analysis.
The previous four AWFS were held in Hangzhou in 2002, Nanjing in 2003,
Xi'an in 2004, and Beijing in 2005. The scope of the 5th AWFS is extended
to include artificial intelligence methodologies and the design and
implementation of symbolic computation software. It is expected that this
workshop will further stimulate various activities leading to formation
of new forums for Asian researchers in the area of software science and

* Topics
Specific topics for AWFS 2007 include (but are not limited to):
- Logics of programs, program generation, transformation, evolution,
and reasoning
- Formal methods and artificial intelligence for software development
- Programming methodologies and paradigms
- Programming language design and semantics
- Software development methodologies, tools, and environments
- Software specification, verification, testing, analysis, refinement,
and model checking
- Software architectures, software reuse, and user interface design
- Software for distributed, parallel, web/Internet-based, and mobile
- Design and implementation of symbolic computation software
- Empirical studies of software tools and methods
- Database theory and data mining

* Invited Speakers
Main invited talks will be given by:
- Jifeng He (East China Normal University)
- Wei Li (Beihang University, China)
- Masahiko Sato (Kyoto University, Japan)
- Jingzhong Zhang (Chinese Academy of Sciences)

Other invited speakers include: Huacan He (Xi'an), Zhenjiang Hu (Tokyo),
Shigeru Igarash (Tsukuba), Andres Iglesias Prieto (Santander), Tomoaki
Kawaguchi (Tsukuba), Shilong Ma (Beijing), Atsushi Ohori (Sendai),
Zongyan Qiu (Beijing), Renaud Rioboo (Paris), Taiichi Yuasa (Kyoto),
Jian Zhang (Beijing).

* Dates
- Deadline for abstract submission: March 15, 2007
- Notification of acceptance or rejection: April 15, 2007
- Workshop taking place: June 1-3, 2007


From: "Kirsten Wilden" <>
Date: Tue, 23 Jan 2007 10:09:44 -0500
Subject: CFP, SIAM Conf on Analysis of Partial Differential Equations, Dec 2007

SIAM Conference on Analysis of Partial Differential Equations(PD07)
Call for Paper Deadlines

Conference Name: SIAM Conference on Analysis of Partial Differential
Equations (PD07)

Location: Hilton Phoenix East/Mesa, Mesa, Arizona

Dates: December 10-12, 2007

The Call for Presentations for this conference is available at:


Minisymposium proposals: May 11, 2007

Abstracts for all contributed and minisymposium presentations: June 11,

For additional information, contact SIAM Conference Department at


From: "LAI, Choi-Hong" <>
Date: Tue, 23 Jan 2007 14:25:04 +0000
Subject: DCABES 2007 - 1st announcement, Aug 2007

DCABES2007 - Call for paperps.

Sixth International Conference on Distributed Computing and Applications
for Business, Engineering and Sciences

14-17 August 2007, Hubei, China.
Hosted by: Wuhan University of Technology

DCABES will bring together researchers and applications developers
in the academic field and industry from around the world to share
their experiences and to explore research collaboration in the areas
of distributed parallel processing and applications. You are invited
to submit an extended abstract/full paper in 4~5 pages, and/or a proposal
to organize a technical session. All accepted abstracts should be
extended by the authors to a full paper (5 pages or less), which will be
published as a book of proceedings (with ISBN) to be distributed at the
conference. Selected papers presented at the DCABES 2007 are referred
to either the International Journal of Computer Mathematics or
Journal of Algorithms and Computational Technology for publication.

Important Dates:-
Submission due: 31st March 2007
Notification of Acceptance: 30th April 2007
Early Registration: Before 15th May 2007
Camera-Ready due: 30th May 2007
Last Registration: Before 31st May 2007
Non-Author Registration: Any time before 17th August 2007

Submissions in all areas of distributed parallel processing and
applications welcome.

Mr. Guo Yucheng (Email: Tel: +86 13986215056)

Steering Committee:-
Guo, Professor Q.P. (Co-Chair) Wuhan University of Technology, Wuhan, China
Lai, Professor C.H. (Co-Chair) University of Greenwich, UK
Tsui, Thomas. Chinese University of Hong Kong, Hong Kong, China
Xu, Professor W. Southern Yangtze University, Wuxi, China


From: Daniel B Szyld <>
Date: Fri, 26 Jan 2007 17:19:23 -0500 (EST)
Subject: Second call for papers. ETNA Special issue for G H Golub

Second Call for papers.

Special Volume in Honor of Gene H. Golub on the Occasion of His 75th Birthday

ETNA, the Electronic Transactions on Numerical Analysis
(, is planning a special volume in honor of
Gene H. Golub on the occasion of his 75th birthday.
The special editors for this volume are:
* Martin Gutknecht,
* Michael Overton,
* Lothar Reichel,
* Daniel Szyld,
* Nick Trefethen,
* Paul Van Dooren, and
* Andy Wathen.
Papers can be submitted following the general ETNA guidelines, to any of
the special editors, no later than February 29, 2007. The papers will
undergo the standard refereeing process.


Date: Sat, 27 Jan 2007 14:28:49 -0500 (EST)
Subject: Postdoctoral Position at the University of Waterloo, Canada

Applications are invited for a postdoctoral position at the
University of Waterloo to carry out research in collaboration with
Professors Miguel Anjos (Management Sciences),
Anthony Vannelli (Electrical & Computer Engineering), and
Henry Wolkowicz (Combinatorics & Optimization).
The area of research is the development of novel optimization
methodologies for solving hard combinatorial problems arising in
real-world applications.

The successful applicant will have a PhD in Operations Research,
Electrical Engineering, Computer Science, or a related field.
Preference will be given to candidates with documented expertise
in mathematical programming techniques.

The starting date will be determined by mutual agreement.
The initial contract will be for 6 to 12 months, with a possibility
of extensions up to a maximum of 2 years in total.

Applicants should send a CV and list of referees to Professor Miguel Anjos
( as a PDF (preferred) or Word file. Applications will
be accepted until the position is filled.

Further information can be obtained from:
Professor Miguel Anjos
+1-519-888-4567 ext 32521


From: "Anne Trefethen" <>
Date: Mon, 22 Jan 2007 11:55:05 -0000
Subject: Research Associate at the Oxford e-Research Centre

Research Associate at the Oxford e-Research Centre

The Oxford e-Research Centre has an opening for a Research Associate to work
on parallel and distributed tools for the support of MATLAB in a Microsoft
cluster environment. The associate will be responsible for defining and
developing technologies and algorithms associated with parallel and
distributed MATLAB to support and enable computational science applications
- the focus will be within the Microsoft CCS environment. He/She will also
work closely with one or more projects using the MS Cluster to drive
understanding and development of the tools. The position holder will work
closely with both developers at MathWorks and Microsoft. The position is for
2 years in the first instance.

The Oxford e-Research Centre (OeRC) is a new research unit at Oxford
University with a focus on research into, and the use of, innovative
computational and information science technologies in multidiscipline
collaborations. The Centre facilitates interdisciplinary research involving
researchers from different disciplines across the University and assists in
defining and developing appropriate research infrastructure.

Full details of this vacancy can be found at


From: "Tim Phillips" <>
Date: Fri, 26 Jan 2007 14:28:00 +0000
Subject: Postdoc Position in Computational Fluid Dynamics at Cardiff University

Post: Postdoc Position in the Schools of Mathematics and Earth Sciences,
Cardiff University, UK.
Duration: 3 years
Project: Modelling of Mantle Convection.

This is an interdisciplinary research project funded by the Leverhulme
Foundation involving the Schools of Mathematics and Earth Sciences at Cardiff
University. All of Earthís geological activity, including plate tectonics,
earthquakes, volcanism and mountain building, is ultimately driven by
convection in the mantle. To better understand this activity we need a means
to realistically model the mantleís convection. While there have been recent
significant advances in modelling mantle convection, no realistic models exist
in spherical geometry which mimic both plate tectonics and temperature
dependent viscosity at Earth-like vigour. The primary objective of this
project is to develop a robust implementation of temperature dependent
viscosity, stable at Earth-like vigour. A secondary objective is to
incorporate more sophisticated rheology for the cold near surface boundary
layer to generate self-consistent plates. The ability to have self-forming
plates is absolutely critical for correctly modelling mantle dynamics.

Applicants should have a PhD, or be close to completion, in geophysics,
applied mathematics, engineering or equivalent. The ability to write
numerical software is essential

Informal enquiries to Professor Tim Phillips (, Tel. +44
2920 874194).

For full further particulars and application details see our jobs website


From: Hans De Sterck <>
Date: Wed, 24 Jan 2007 18:37:16 -0500
Subject: New Masterís in Computational Mathematics at University of Waterloo


The Faculty of Mathematics of the University of Waterloo announces a new
one-year Masterís program in Computational Mathematics. The program comprises
courses in both the theory and applications of the interdisciplinary field of
Computational Mathematics, and culminates in a one-term supervised research
project. Core areas include discrete computational mathematics, numerical
methods, computational statistics and machine learning, scientific computing,
and computational optimization. The program is subject to approval by the
Ontario Council on Graduate Studies.

With more than 200 faculty members, the Faculty of Mathematics of the
University of Waterloo contains one of the largest concentrations of research
in the mathematical and computer sciences in North America. Waterloo is
located in the heart of Southern Ontario, one hour west of Toronto.

targeted to students with a bachelorís degree in mathematics, statistics, or
computer science, or in another program with a strong mathematical component,
including economics, engineering and any of the physical sciences. Funding is
available for qualifying applicants.

More information about the Waterloo Computational Mathematics Masterís program
is available online at .


From: Liz Martin <>
Date: Thu, 25 Jan 2007 13:21:12 +0000
Subject: Contents, Inverse Problems, volume 23, issue 1, February 2007

Volume 23, Issue 1, February 2007
Pages: 1--462

Individual articles are free for 30 days following their publication on
the web. This issue is available at:


Selective focusing on small scatterers in acoustic waveguides using time
reversal mirrors
B Pin{\c{c}}on and K Ramdani

The factorization method in inverse elastic scattering from penetrable
A Charalambopoulos, A Kirsch, K A Anagnostopoulos, D Gintides and K

Detecting corrosion using thermal measurements
T Hohage, M-L Rap\'un and F-J Sayas

Subsurface imaging via fully coupled elastic wavefield extrapolation
M N Guddati and A H Heidari

The inverse spectral problem for the discrete cubic string
J Kohlenberg, H Lundmark and J Szmigielski

Numerical studies on the globally convergent convexification algorithm in
M V Klibanov and A Timonov

Accounting for the definition domain of the forward map in traveltime
tomography---application to the inversion of prismatic reflections
M Cavalca and P Lailly

An inverse eigenvalue problem for periodic Jacobi matrices
Y-H Xu and E-X Jiang

An inverse source problem for the heat equation and the enclosure method
M Ikehata

Cone-beam pseudo-lambda tomography
Y Ye, H Yu and G Wang

An analysis of Tikhonov regularization for nonlinear ill-posed problems
under a general smoothness assumption
S Lu, S V Pereverzev and R Ramlau

On inverse problems for the multidimensional relativistic Newton equation
at fixed energy
A Jollivet

Updating quadratic models with no spillover effect on unmeasured spectral
M T Chu, W-W Lin and S-F Xu

A global Carleman estimate in a transmission wave equation and application
to a one-measurement inverse problem
L Baudouin, A Mercado and A Osses

Wronskian solutions of the Boussinesq equation---solitons, negatons,
positons and complexitons
C-X Li, W-X Ma, X-J Liu and Y-B Zeng

On unique determination of partially coated polyhedral scatterers with far
field measurements
H Liu and J Zou

A new phase space method for recovering index of refraction from travel
E Chung, J Qian, G Uhlmann and H Zhao

Optimal regularization with two interdependent regularization parameters
F Bauer and O Ivanyshyn

Inverse oscillation theory for Sturm--Liouville problems with
non-separated boundary conditions
P A Binding and H Volkmer

A procedure for the temperature reconstruction in corner domains from
Cauchy data
T Johansson and L Marin

Explicit inversion formulae for the spherical mean Radon transform
L A Kunyansky

Passive gamma tomography reconstruction of layered structures in nuclear
waste vaults
N S Mera

Convergent simplex searches and the `gloveless DataGlove'
W J Barker and P A Conway

Stability results for a Cauchy problem for an elliptic equation
D N H\`ao, P M Hien and H Sahli


From: Liz Martin <>
Date: Mon, 22 Jan 2007 16:36:23 +0000
Subject: Contents, Nonlinearity, volume 20, issue 2, February 2007


Volume 20, Issue 2, February 2007

Individual articles are free for 30 days following their publication on
the web. This issue is available at: URL:

Pages: 221--522


Partial reductions of Hamiltonian flows and Hess--Appel'rot systems on
{\it SO}({\it n})
B Jovanovi\'c

Homoclinic tangencies of arbitrarily high orders in conservative and
dissipative two-dimensional maps
S Gonchenko, D Turaev and L Shilnikov

Characterization of stable kinetic equilibria of rigid, dipolar rod
ensembles for coupled dipole--dipole and Maier--Saupe potentials
H Zhou, H Wang, Q Wang and M G Forest

Finite time rupture for thin films under van der Waals forces
K-S Chou and Y-C Kwong

Travelling waves in Hamiltonian systems on 2D lattices with nearest
neighbour interactions
M Fe\v ckan and V M Rothos

On travelling wave solutions of the Burgers--Korteweg--de Vries equation
Z Feng

Algebraically decaying pulses in a Ginzburg--Landau system with a
neutrally stable mode
A Doelman, G Hek and N Valkhoff

Coding trees and boundaries of attracting basins for some entire maps
K Bara\'nski and B Karpi\'nska

The quasi-periodic Hamiltonian Hopf bifurcation
H W Broer, H Han{\ss}mann and J Hoo

The black solitons of one-dimensional NLS equations
L Di Menza and C Gallo

Uniqueness of central foliations of geodesic flows for compact surfaces
without conjugate points
J Barbosa Gomes and R O Ruggiero

Notes on perturbations of the incompressible 3D Euler equations
D Chae

End of NA Digest