Today's Editor:
David S. Bindel
Cornell University
bindel@cornell.edu
Today's Topics:
Responses regarding selection of the correct branch in matrix logarithm
Summer School and Workshop on Advanced Numerical Methods – VIASM, Hanoi, Vietnam, June 9–14, 2025
Workshop in honor of Albert Cohen's 60th Birthday, June 2025
pyMOR School and User Meeting, Croatia, Sep 2025
Women in PDEs at Karlsruhe Institute of Technology, on October 23-24, 2025
Call for submissions, Vortex2025 international conference, Dec 2025
Assistant/Associate Professorship (Knowledge Exchange) at Heriot-Watt University, Edinburgh, UK
Seeking candidate for Marie Curie Postdoctoral Fellowship, UK
PhD and Postdoc positions in Computational PDEs at the University of Vienna, Austria
PhD position in Applied Mathematics, University of Bergen, Norway
Contents, Philos. Trans. R. Soc. A 383 (2298): 'PDEs in data science'
See this issue of NA Digest on the web at:
https://na-digest.coecis.cornell.edu/na-digest-html/25/v25n23.html
Submissions, FAQs, and archives:
https://na-digest.coecis.cornell.edu/
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From: Stephen Vavasis vavasis@uwaterloo.ca
Date: June 03, 2025
Subject: Responses regarding selection of the correct branch in matrix logarithm
Several weeks ago I asked on this forum how to solve the equation
expm(X)=expm(P)*expm(S) given skew-symmetric matrices S and P, so that
the computed X is close to S when P is close to 0. I received great
responses from Matthias Ehrhardt, Zehua Lai, John Maddocks, Brynjulf
Owren, Marc Steinbach, and Charlie Van Loan (who even sent a code!)
The proposed approaches include:
(1) Use the Baker-Campbell-Hausdorff series expansion for
expm(P)*expm(S), which converges when P is small. I was not
previously aware of this expansion.
(2) Compute one solution X to expm(X)=expm(P)*exp(S) using, e.g.,
Matlab statement X = logm(expm(P)*expm(S)). Then diagonalize S and X.
Add suitable multiples of 2*pi*i to the complex eigenvalues of X to
bring them close to the corresponding eigenvalues of S.
(3) Use an iterative method to minimize
norm(expm(X)-expm(P)*expm(S))^2, a nonlinear least-squares problem,
with respect to X, and use S as the initial guess for X.
(4) There may be an exact formula for X in the special case n=3 (which
is the case in the application) that goes back to the Rodrigues in the
19th century. I haven't been able to track this down yet.
Thanks again to all the respondents!
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From: Vu Thai Luan vu.luan@ttu.edu
Date: May 30, 2025
Subject: Summer School and Workshop on Advanced Numerical Methods – VIASM, Hanoi, Vietnam, June 9–14, 2025
Dear Colleagues,
We are pleased to announce the Summer School and Workshop on Advanced
Numerical Methods for Deterministic and Stochastic Differential
Equations, which will be held at the Vietnam Institute for Advanced
Study in Mathematics (VIASM), Hanoi, from June 9–14, 2025.
Website: https://viasm.edu.vn/hdkh/summer-school-on-anm2025
Registration: FREE
https://viasm.edu.vn/hdkh/summer-school-on-anm2025?
userkey=registration
Deadline: June 2, 2025
**************************
Summer School Lecturers
Vu Thai Luan (Texas Tech University, USA)
Daniel R. Reynolds (Southern Methodist University, USA)
David Shirokoff (New Jersey Institute of Technology, USA)
Kazuhiro Yasuda (Hosei University, Japan)
Workshop Speakers
Plenary Speakers:
Qiang Du (Columbia University, USA)
Yoshio Komori (Kyushu Institute of Technology, Japan)
Invited Speakers:
Dang Quang A (Vietnam Academy of Science and Technology)
Begoña Cano (University of Valladolid, Spain)
Nguyen Huu Du (Vietnam National University, HUS)
Eskil Hansen (Lund University, Sweden)
Lili Ju (University of South Carolina, USA)
Takuya Nakagawa (Ritsumeikan University, Japan)
Ngo Hoang Long (Hanoi National University of Education, Vietnam)
Vu Thai Luan (Texas Tech University, USA)
Amnon J. Meir (Southern Methodist University, USA)
Daniel Reynolds (Southern Methodist University, USA)
David Shirokoff (New Jersey Institute of Technology, USA)
Raymond Spiteri (University of Saskatchewan, Canada)
Dai Taguchi (Kansai University, Japan)
Do Duc Thuan (Hanoi University of Science and Technology, Vietnam)
Kazuhiro Yasuda (Hosei University, Japan)
**************************
For questions, please contact our event secretary, Mr. Nguyen Quang
Huy at nqhuy@viasm.edu.vn, or reach out to me directly at
vu.luan@ttu.edu. We warmly welcome your participation and look
forward to seeing you in Hanoi this June!
Organizing Committee:
Vu Thai Luan (Texas Tech)
Ngo Hoang Long (Hanoi National University of Education)
Le Minh Ha (Vietnam Institute for Advanced Study in Mathematics)
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From: Martin Campos Pinto martin.campos-pinto@ipp.mpg.de
Date: May 30, 2025
Subject: Workshop in honor of Albert Cohen's 60th Birthday, June 2025
We are happy to announce a workshop on "Nonlinear Approximation for
High-Dimensional Problems", to celebrate Albert Cohen's 60th birthday.
The workshop will be held at the Paris Campus Pierre et Marie Curie
(Jussieu) from June 30 to July 4, 2025.
The program and registration details are available at
https://albertcohen.sciencesconf.org
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From: Petar Mlinarić petar.mlinaric@math.hr
Date: June 05, 2025
Subject: pyMOR School and User Meeting, Croatia, Sep 2025
We are delighted to invite you to the seventh pyMOR School, taking
place from September 8-12, 2025, in Zagreb, Croatia.
This school is targeted at anyone interested in applying model order
reduction in their work using pyMOR (https://pymor.org). It will offer
interactive lectures on some of the most important MOR methods and how
to use these methods with pyMOR. In hands-on sessions, participants
will have the opportunity to either gain more experience with pyMOR
through exercise problems or to work on integrating pyMOR into their
existing projects with the help of the pyMOR developers.
Experienced users of pyMOR and related software packages are also
invited to join us for the school and give talks. A code sprint will
take place on Thursday evening.
Registration is open until August 25, 2025.
For further information, visit https://school.pymor.org
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From: LAURETTE LAUFFER ADMIN@WAVES.KIT.EDU
Date: June 02, 2025
Subject: Women in PDEs at Karlsruhe Institute of Technology, on October 23-24, 2025
We are very happy to invite you to our upcoming workshop "Women in
PDEs" at Karlsruhe Institute of Technology, on October 23-24, 2025.
Our collaborative research center "Wave phenomena: analysis and
numerics" at Karlsruhe Institute of Technology will host for the
second time the workshop "Women in PDEs@Karlsruhe". Eight outstanding
women will give scientific plenary talks. Additionally, there will be
a poster session, for which female participants can apply, a moderated
discussion panel, and a joint dinner. In this workshop only women will
give talks - but all interested women and men are most cordially
invited to participate. Limited resources for travel support are
available on request. For registration and more details please go to
https://womeninpdes.waves.kit.edu/2025/.
Contact: admin@waves.kit.edu
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From: Yifei Yu yifei.yu@uta.edu
Date: June 06, 2025
Subject: Call for submissions, Vortex2025 international conference, Dec 2025
We would like to invite you to attend the international conference
Vortex2025, sponsored by NSF. This conference will be held in the
University of Texas at Arlington, Arlington, TX, USA. The conference's
website is https://vortexconference2025.uta.edu/. This conference
focuses on vortex definition and prediction. Any new ideas, methods,
and applications related to vortices are welcome to attend this
conference. Travel supports are available for selected participants.
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From: Lehel Banjai hod.maths@hw.ac.uk
Date: June 06, 2025
Subject: Assistant/Associate Professorship (Knowledge Exchange) at Heriot-Watt University, Edinburgh, UK
The Department of Mathematics, Heriot-Watt University, seeks to
appoint an Assistant/Associate Professor in Knowledge Exchange to
complement and enhance the expertise of both the Department of
Mathematics and the Mathematics Driven Innovation Centre (M-DICE). The
successful candidate will play a key role in advancing the
Department’s knowledge exchange activities and fostering collaboration
with internal and external partners – including those in academia,
industry, public sector and government – to translate academic
research into real-world impact. In addition, the appointee will
contribute to the Department’s core teaching activities.
The closing date for applications is Monday 30th June 2025. For more
information and how to apply see:
https://enzj.fa.em3.oraclecloud.com/hcmUI/CandidateExperience/en/job/4340
For more information on M-DICE see:
https://mdice.site.hw.ac.uk/
Any questions about the post can be addressed to: Lehel Banjai
hod.maths@hw.ac.uk.
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From: Daniel Lesnic D.Lesnic@leeds.ac.uk
Date: May 31, 2025
Subject: Seeking candidate for Marie Curie Postdoctoral Fellowship, UK
A highly qualified candidate with strong expertise in applied
numerical mathematics inverse problems to apply for a two-year long
Marie Curie fellowship (attractive salary over €100K plus family
allowance and conference travel funding) is sought. Requirements:
• Hold a PhD in applied mathematics, with focus on inverse problems,
with max. 8 years of full-time equivalent research experience since
obtaining the PhD
• Strong record of publication commensurable with the current career
stage
• Open to any nationality but fluent in English
• Must not have resided or worked in United Kingdom for more than 12
months in the last 3 years
Application process (please email as soon as possible but no later
than 10 July 2025 the supervisor at D.Lesnic@leeds.ac.uk):
• A cover letter explaining the motivation for applying and commitment
of availability to be in Leeds for 2 years (to commence between
September 2026 to September 2027 for a period of 24 months) should
the Marie Curie application be successful (deadline for application
is 10 September 2025 with answer given around February 2026; also
noting that most of the inverse problems application has already
been written by the supervisor). It is very important that in case
you wish to keep your present job/position at your institution you
seek (formal or informal) approval from your manager that allows you
unpaid study leave to Leeds in person for a period of 24 months.
However, if you do not wish to keep your position or your current
position is not permanent and ends in the next two years or do not
hold a position, this approval is not necessary but your commitment
should be clearly stated in your cover letter.
• Short CV (up to 2 pages), a list of your publications and contact
details of two referees.
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From: Olga Mula olga.mula.hernandez@univie.ac.at
Date: June 03, 2025
Subject: PhD and Postdoc positions in Computational PDEs at the University of Vienna, Austria
There are two open PhD positions, and one PostDoc position at the
Faculty of Mathematics of the University of Vienna, within the group
of Computational PDEs led by Prof. Olga Mula.
The topics are at the intersection between numerical analysis of PDEs,
data assimilation, optimal transport and machine learning.
PhD 1: Data Assimilation of Wasserstein Gradient Flows
https://jobs.univie.ac.at/job/University-assistant-predoctoral/1210407901/
PhD 2: Analysis of Deep Learning Methods for Singularly Perturbed PDEs
https://jobs.univie.ac.at/job/University-assistant-predoctoral/1210408701/
Postdoc: Adaptive Schemes for High-Dimensional Fokker-Planck Equations
https://jobs.univie.ac.at/job/Uni-postdoctoral-Mathematics/1210409301/
Deadline to apply: July 8, 2025.
Starting date: Between September 2025 and February 2026.
Interviews will be scheduled from mid-June until July 18, 2025.
Please contact olga.mula.hernandez@univie.ac.at for further details.
-------------------------------------------------------
From: Jakub Wiktor Both jakub.both@uib.no
Date: June 05, 2025
Subject: PhD position in Applied Mathematics, University of Bergen, Norway
The Porous Media Group at the University of Bergen, Norway, invites
applications for a fully funded PhD position in applied
mathematics. This position is part of the recently awarded FRIPRO
project, funded by the Research Council of Norway.
The project focuses on advancing simulation technologies for
geological CO₂ storage, with a strong emphasis on validation against
high-resolution, meter- scale laboratory experiments using the
FluidFlower setup
(https://www.youtube.com/watch?v=5WZI_y-jdu4).
The candidate will work at the intersection of applied mathematics,
data analysis, and laboratory reservoir physics. The position is
embedded in a highly interdisciplinary and collaborative porous media
research environment.
Application deadline: June 23, 2025
Further information on the project and how to apply:
https://www.jobbnorge.no/en/available-jobs/job/281636/phd-research-fellow-in-applied-and-computational-mathematics
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From: Jonas Latz jonas.latz@manchester.ac.uk
Date: June 05, 2025
Subject: Contents, Philos. Trans. R. Soc. A 383 (2298): 'PDEs in data science'
Philosophical Transactions of the Royal Society A: Mathematical,
Physical and Engineering Sciences
Volume 383, Issue 2298
05 June 2025
Theme issue 'Partial differential equations in data science' organised
and edited by Andrea L. Bertozzi, Nadejda Drenska, Jonas Latz, Matthew
Thorpe.
https://royalsocietypublishing.org/toc/rsta/2025/383/2298
__
Andrea L. Bertozzi, Nadejda Drenska, Jonas Latz, Matthew Thorpe:
Partial differential equations in data science
Martin Burger, Samira Kabri, Yury Korolev, Tim Roith, Lukas Weigand:
Analysis of mean-field models arising from self-attention dynamics in
transformer architectures with layer normalization
Jingcheng Lu, Jeff Calder:
Attraction–repulsion swarming: a generalized framework of t-SNE via
force normalization and tunable interactions
Nicolás García Trillos, Aditya Kumar Akash, Sixu Li, Konstantin Riedl,
Yuhua Zhu:
Defending against diverse attacks in federated learning through
consensus- based bi-level optimization
Anna Rosenberg, John Kennedy, Zohar Keidar, Yehoshua Y. Zeevi, Guy
Gilboa:
Ensemble of weak spectral total-variation learners: a PET–CT case
study
Annika Lang, Björn Müller:
Isotropic Q-fractional Brownian motion on the sphere: regularity and
fast simulation
Martin Kolodziejczyk, Michela Ottobre, Gideon Simpson:
Counting the number of stationary solutions of partial differential
equations via infinite dimensional sampling
Sahani Pathiraja, Philipp Wacker:
Connections between sequential Bayesian inference and evolutionary
dynamics
Chaoyu Liu, Chris Budd, Carola-Bibiane Schönlieb:
Inverse evolution data augmentation for neural PDE solvers
Richard Duong, Nicolaj Rux, Viktor Stein, Gabriele Steidl:
Wasserstein gradient flows of maximum mean discrepancy functionals
with distance kernels under Sobolev regularization
Kai Bergermann, Martin Stoll:
Gradient flow-based modularity maximization for community detection in
multiplex networks
Wilson G. Gregory, David W. Hogg, Ben Blum-Smith, Maria Teresa Arias,
Kaze W. K. Wong, Soledad Villar:
Equivariant geometric convolutions for dynamical systems on vector and
tensor images
Teo Deveney, Jan Stanczuk, Lisa Kreusser, Chris Budd, Carola-Bibiane
Schönlieb:
Closing the ODE–SDE gap in score-based diffusion models through the
Fokker–Planck equation
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End of Digest
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