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BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-412348528@www.mn.uio.no
DTSTART:20210928T081500Z
DTEND:20210928T100000Z
LOCATION:Seminar room 1020, Niels Henrik Abel's house
DESCRIPTION:The PDE seminars for the Autumn of 2021 will be held every Tuesday from 10:15–12:00
SUMMARY:PDE seminar
URL:https://www.mn.uio.no/math/english/research/groups/pde/events/seminars/pde-seminar-autumn-2021.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-01499968946@www.mn.uio.no
DTSTART:20210930T120000Z
DTEND:20210930T134500Z
LOCATION:NHA B1120
DESCRIPTION:In a famous paper, Geir Ellingsrud and Stein Arild Strømme use the Atiyah-Bott localization theorem in equivariant cohomology to compute the number of complex twisted cubics on a complete intersection. Motivated by results from A1-homotopy theory there is a new way of doing such enumerative counts which works over an arbitrary base field, not only the complex numbers. Recently, Marc Levine proved a version of Atiyah-Bott localization for this new way of counting. In the talk I will recall the classical Atiyah-Bott localization theorem and explain how one can use it in enumerative geometry. Furthermore, I will explain how this new way of counting works and present some results about twisted cubics on complete intersections counted this way. This is based on joint work with Marc Levine.
SUMMARY:Sabrina Pauli (Duisburg-Essen): Counting twisted cubics over an arbitrary base field
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/seminars/2021/pauli.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-01309595206@www.mn.uio.no
DTSTART:20211001T090000Z
DTEND:20211001T100000Z
LOCATION:Online
SUMMARY:STAR-seminars: Mathieu Rosenbaum
URL:https://www.mn.uio.no/math/english/research/projects/storm/events/seminars/star-online-seminars/2021-10-01%20Mathieu%20Rosenbaum.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-1722413221@www.mn.uio.no
DTSTART:20211005T121500Z
DTEND:20211005T140000Z
LOCATION:Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor
DESCRIPTION:Marginal maximum likelihood estimation of longitudinal latent variable models for ordinal observed variables is challenging due to the high latent dimensionality required to accurately model residual dependencies for repeated measurements. We use second-order Laplace approximations to the high-dimensional integrals in the marginal likelihood function for longitudinal item response theory models and implement an efficient estimation method based on the approximations. The method is illustrated with items from the Montreal Cognitive Assessment, administered at four time points in a Hong Kong study of aging and well-being. We discuss the limitations of the proposed estimation method and outline a potential extension to the approach that uses a dimension-reduction technique.
SUMMARY:Björn Andersson: Estimation of longitudinal item response theory models with a second-order Laplace approximation
URL:https://www.mn.uio.no/math/english/research/groups/statistics-data-science/events/seminars/Bj%C3%B6rn%20Andersson.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-0905997240@www.mn.uio.no
DTSTART:20211007T121500Z
DTEND:20211007T140000Z
LOCATION:NHA B1120
DESCRIPTION:Stable polynomials are a multivariate generalization of real-rooted univariate polynomials. This notion of stability for hypersurfaces can be extended to lower-dimensional varieties, giving rise to positively hyperbolic varieties. I will present results showing that tropicalizations of positively hyperbolic varieties are very special polyhedral complexes with a rich combinatorial structure. This, in particular, generalizes a result of P. Brändén showing that the support of a stable polynomial must be an M-convex set.
SUMMARY:Felipe Rincón (Queen Mary University of London): Positively hyperbolic varieties and their tropicalization
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/seminars/2021/felipe-rincon.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-765593708@www.mn.uio.no
DTSTART:20211014T121500Z
DTEND:20211014T140000Z
LOCATION:NHA B1120
SUMMARY:Ragni Piene (UiO): TBA
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/seminars/2021/piene.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-1255270807@www.mn.uio.no
DTSTART:20211015T090000Z
DTEND:20211015T100000Z
LOCATION:Online
SUMMARY:STAR-seminars: Luca Galimberti
URL:https://www.mn.uio.no/math/english/research/projects/storm/events/seminars/star-online-seminars/2021-10-15%20Luca%20Galimberti.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-0452389372@www.mn.uio.no
DTSTART:20211018T121500Z
DTEND:20211018T140000Z
LOCATION:Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor
DESCRIPTION:In this talk I will discuss the variational form of Bayes theorem by Zellner (1988). This result is the rationale behind the variational (approximate) inference scheme, although it is not always that clear in modern presentations. I will discuss two applications of this results. First, I will show how to do a low-rank mean correction within the INLA framework (with amazing results), which is essential for the next generation of the R-INLA software currently in development. In the second one, I will introduce the Bayesian learning rule, which unify many machine-learning algorithms from fields such as optimization, deep learning, and graphical models. This includes classical algorithms such as ridge regression, Newton's method, and Kalman filter, as well as modern deep-learning algorithms such as stochastic-gradient descent, RMSprop, and Dropout. The first part of the talk is based on our recent research at KAUST, while the second part is based upon \texttt{arxiv.org/abs/2107.04562} with Dr. Mohammad Emtiyaz Khan, RIKEN Center for AI Project, Tokyo.
SUMMARY:Håvard Rue: Two applications of the variational form of Bayes theorem
URL:https://www.mn.uio.no/math/english/research/groups/statistics-data-science/events/seminars/H%C3%A5vard%20Rue.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-01866073546@www.mn.uio.no
DTSTART:20211019T121500Z
DTEND:20211019T140000Z
LOCATION:Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor
SUMMARY:Erik Bølviken: Fitting distributions when the parameters are unimportant: an actuarial viewpoint.
URL:https://www.mn.uio.no/math/english/research/groups/statistics-data-science/events/seminars/Erik%20B%C3%B8lviken.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-01614854728@www.mn.uio.no
DTSTART:20211021T121500Z
DTEND:20211021T140000Z
LOCATION:NHA B1120
SUMMARY:Kris Shaw (UiO): TBA
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/seminars/2021/shaw.html
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20210925T031333Z
UID:20210925T011333-1523471288@www.mn.uio.no
DTSTART:20211104T131500Z
DTEND:20211104T150000Z
LOCATION:NHA B1120
SUMMARY:Geir Ellingsrud (UiO) (TBC)
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/seminars/2021/ellingsrud.html
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