Alexander Kasprzyk

I couldn’t find anything obvious. And yes, he’s a lovely person, always so generous with his time and his ideas. Whenever one of our students has the opportunity to spend some time visiting him they always return full of energy.

Bernd Siebert (UT Austin) Bernd Siebert (UT Austin)17 March 2023"Toward the logarithmic Hilbert scheme"Logarithmic geometry provides tools to work relative a normal crossings divisor,...

Bernd Siebert (UT Austin) speaking on "Toward the logarithmic Hilbert scheme" at our #AlgebraicGeometry #Math seminar back in March 2023. #MathSky

"I understand that the compact you feel about working for a university has now been broken. The compact that you weren't going to earn very much money but you had a secure job for life in a comfortable environment without a heavy workload. That's gone."
@uniofnottingham.bsky.social VC to staff.

Just a quick reminder that our Vice Chancellor said this into a microphone in front of university employees last week and thought nothing of it!

Warnings from the Universities of #Nottingham, #Cardiff, and #Essex about the substantial reduction in research time. “Doing more with less” isn’t realistic when you’re already operating at the limit of what’s possible. The fat isn’t there to be cut.

Mori dream bonds and C^*-actions We construct a correspondence between Mori dream regions arising from small modifications of normal projective varieties and C^*-actions on polarized pairs which are bordisms. Moreover, we show that the Mori dream regions constructed in this way admit a chamber decomposition on which the models are the geometric quotients of the C^*-action. In addition, we construct, from a given C^*-action on a polarized pair for which there exist at least two admissible geometric quotients, a C^*-equivariantly birational C^*-variety, whose induced action is a bordism, called the pruning of the variety.

The work discussed by Stefano Urbinati - joint with Lorenzo Barban, Eleonora Romano, and Luis Solá Conde - was published last year in Mathematische Nachrichten.
onlinelibrary.wiley.com/doi/full/10....

Stefano Urbinati (Udine) Stefano Urbinati (Udine)16 March 2023"Mori Dream Pairs and C^*-actions"The idea of the talk is that of giving a connection between "local" Mori theory and C*...

Stefano Urbinati (Udine) speaking on "Mori Dream Pairs and C^*-actions" at our #AlgebraicGeometry #Math seminar back in March 2023. #MathSky

A picture of the trent building with the following text over the top: Work at the university of nottingham! "The compact... about working for a university... where you weren't going to each very much money, but you had a secure job for life in a comfortable environment without a heavy workload: yeah, that's gone." -Your Vice Chancellor, into a microphone, at a recent town hall! 110% Workload! Low Pay! Zero Security! Lots of stress! Hearting barely works in any building! Join us today! ...because what else are you going to do? Brought to you by your UCU, Unison, and Unite Branches

That quote in the top right? The one where our vice chancellor said that we can no longer expect a comfortable place to work and a light workload in exchange for no pay? Yeah, she actually said that.

Quartic surfaces up to volume preserving equivalence We study log Calabi–Yau pairs of the form (P^3,\Delta), where \Delta is a quartic surface, and classify all such pairs of coregularity less than or equal to one, up to volume preserving equivalence. In particular, if (P^3,\Delta) is a maximal log Calabi–Yau pair then we show that it has a toric model.

The work described by Tom Ducat was published in Selecta Mathematica.
link.springer.com/article/10.1...

Tom Ducat (Durham) Tom Ducat (Durham)9 March 2023"Quartic surfaces up to volume preserving equivalence"We consider log Calabi–Yau pairs of the form (P^3,D), where D is a quarti...

Tom Ducat (Durham) speaking on "Quartic surfaces up to volume preserving equivalence" at our #AlgebraicGeometry #Math seminar back in March 2023. #MathSky

Forbidden patterns in tropical plane curves Tropical curves in R^2 correspond to metric planar graphs but not all planar graphs arise in this way. We describe several new classes of graphs which cannot occur. For instance, this yields a full combinatorial characterization of the tropically planar graphs of genus at most five.

See also "Forbidden patterns in tropical plane curves" by Michael Joswig and Ayush Kumar Tewari, published in Beiträge zur Algebra und Geometrie.
link.springer.com/article/10.1...

Ayush Kumar Tewari (Ghent) Ayush Kumar Tewari (Ghent)2 March 2023"Forbidden patterns in tropical planar curves and panoptigons"Tropical curves in R^2 correspond to metric planar graphs...

Ayush Kumar Tewari (Ghent) speaking on "Forbidden patterns in tropical planar curves and panoptigons" at our #AlgebraicGeometry #Math seminar back in March 2023. #MathSky

Ditto. It’s a classic.

More of an amazing treat. Baked beans on toast were the emergency staple.

This is astonishing. Exactly the same thing happened here on Tuesday. Verdict: so-so.

Future Nottingham, CMC, course closures, student staff ratios, the slashing of research time... all of this is going to destroy the foundation of this university and what makes it so necessary at this precise moment in history.

Relative quantum cohomology under birational transformations We study how relative quantum cohomology, defined by Tseng--You and Fan--Wu--You, varies under birational transformations. For toric complete intersections with simple normal crossings divisors that…

For further details see Fenglong You's arXiv preprint.
arxiv.org/abs/2204.00509

Fenglong You (ETH-Zurich) Fenglong You (ETH-Zurich)22 February 2023"Relative quantum cohomology under birational transformations"I will talk about how relative quantum cohomology, def...

Fenglong You (ETH-Zurich) speaking on "Relative quantum cohomology under birational transformations" at our #AlgebraicGeometry #Math seminar back in February 2023. #MathSky

@uniofnottingham.bsky.social is closing courses, slashing research funding, and making staff redundant (with a whopping £85m hole in their finances) and all the while somehow the number of top earners is increasing significantly. It just doesn’t seem justifiable.

Nottingham cuts ‘threaten status as research-intensive university’ Move to reduce academics’ protected research time to 25 per cent brings union warning Academics at the University of Nottingham have warned that its status as a research-intensive institution is under threat from proposals to cut protected research time. Nottingham is going through the second phase of a restructuring programme in response to financial pressure. That has already prompted pushback against the suspension of recruitment to, and the potential closure of, courses including music, languages and nursing.

"Move to reduce academics’ protected research time to 25 per cent brings union warning ... that its status as a research-intensive institution is under threat"
@uniofnottingham.bsky.social
www.researchprofessionalnews.com/rr-news-uk-u...

A Generalization of the Murnaghan–Nakayama Rule for K-k-Schur and k-Schur Functions The K-k-Schur functions and k-Schur functions appeared in the study of K-theoretic and affine Schubert Calculus as polynomial representatives of Schubert classes. In this paper, we introduce a new family of symmetric functions \mathcal{F}_\lambda^{(k)}⁠, that generalizes the constructions via the Pieri rule of K-k-Schur functions and k-Schur functions. Then we obtain the Murnaghan–Nakayama rule for the generalized functions. The rule is described explicitly in the cases of K-k-Schur functions and k-Schur functions, with concrete descriptions and algorithms for coefficients. Our work recovers the result of Bandlow, Schilling, and Zabrocki for k-Schur functions, and explains it as a degeneration of the rule for K-k-Schur functions. In particular, many other special cases and connections promise to be detailed in the future.

This work by Duc-Khanh Nguyen was published in International Mathematics Research Notices.
academic.oup.com/imrn/article...

Duc-Khanh Nguyen (Albany) Duc-Khanh Nguyen (Albany)16 February 2023"A generalization of the Murnaghan-Nakayama rule for K-k-Schur and k-Schur functions"We introduce a generalization o...

Duc-Khanh Nguyen (Albany) speaking on "A generalization of the Murnaghan-Nakayama rule for K-k-Schur and k-Schur functions" at our #AlgebraicGeometry #Math seminar back in February 2023. #MathSky

arXiv papers for Gianni Petrella

Check out Gianni's work on the arXiv. #QuiverModuli #AlgebraicGeometry #RepresentationTheory
arxiv.org/search/?quer...

Gianni Petrella Personal website of Gianni Petrella, a mathematician at the University of Luxembourg.

Gianni Petrella (Luxemburg) is visiting me for the next month. Gianni is a student of @pbelmans.bsky.social and an expert in quiver moduli. It's a great pleasure to have him in Warwick.
giannipetrella.eu

Invariance of plurigenera fails in positive and mixed characteristic We construct smooth families of elliptic surface pairs with terminal singularities over a DVR of positive or mixed characteristic $(X,B)\to \mathrm{Spec}R$, such that $P_m(X_k,B_k)>P_m(X_K,B_K)$ for…

For more details see Iacopo Brivio's arXiv preprint.
arxiv.org/abs/2011.10226

Iacopo Brivio (NCTS) Iacopo Brivio (NCTS)9 February 2023"Invariance of plurigenera and KSBA moduli in positive and mixed characteristic"A famous theorem by Siu states that plurig...

Iacopo Brivio (NCTS) speaking on "Invariance of plurigenera and KSBA moduli in positive and mixed characteristic" at our #AlgebraicGeometry #Math seminar back in February 2023. #MathSky

A screenshot of an article from ResearchProfessional News with the headline "Nottingham cuts 'theatre status as research-intensive university'"

A screenshot of an article from the BBC with the headline "Unions pass no confidence vote in university bosses'"

A screenshot of an article from NottinghamshireLive with the headline "'Breakdown of trust' at University of Nottingham as Vice Chancellor told to quit'"

Hey! We're in the news again! And if the University believes that all press is good press, they're nailing it.

'Breakdown of trust' at University of Nottingham as Vice Chancellor told to quit The Vice Chancellor previously said the actions she was taking were having a 'positive impact'

"This unprecedented move reflects a complete breakdown of trust in the university [of Nottingham]'s senior leadership following years of shocking financial decisions and governance failures." @uniofnottingham.bsky.social

Unions pass no confidence vote in University of Nottingham bosses They say it follows "years of shocking financial decisions and governance failures".

"Union members at the University of Nottingham have passed a motion of no confidence in the vice-chancellor and other senior leaders after a 'complete breakdown of trust'." @uniofnottingham.bsky.social

Yaoxiong Wen (KIAS) Yaoxiong Wen (KIAS)2 February 2023"Mirror symmetry for the parabolic G-Higgs bundle, from local to global"Motivated by geometric Langlands, we initiate a pro...

Yaoxiong Wen (KIAS) speaking on "Mirror symmetry for the parabolic G-Higgs bundle, from local to global" at our #AlgebraicGeometry #Math seminar back in February 2023. #MathSky