CALF SEMINAR
Calf is the junior COW.
The principal organisers are Jørgen Rennemo and Mohammad Akhtar (Imperial). Local organisers include Ruadhaí Dervan (Cambridge), Tom Ducat (Warwick), Tom Hawes (Oxford) and Acyr Locatelli (Bath). Calf announcements are made using the COW mailing list.
The COW seminar has some funds for travel expenses. To make a claim you have to fill in a
Bath travel claim form (the word COW should appear prominently) and
post it to Finance Secretary, Department of Mathematical Sciences,
University of Bath, Bath BA2 7AY.
Previous meetings:

Oxford, 28th February 2014
1.00 Diletta Martinelli (Imperial): Semiampleness of line bundles in positive characteristic (abs)
2.30 Emily Cliff (Oxford): Universal Dmodules (abs)
4.00 Carmelo Di Natale (Cambridge): A period map for global derived stacks (abs)

Bath, 18th November 2013
2.00 Ruadhaí Dervan (Cambridge)  An introduction to Kstability (abs)
3.30 Thomas Prince (Imperial)  From scattering diagrams to GromovWitten theory (abs)
5.00 Alberto Cazzaniga (Oxford)  On some calculation of motivic DonaldsonThomas invariants

Warwick, 19th September 2013
2.00 SeungJo Jung (Warwick)  Moduli of representations of McKay quiver (abs)
3.30 Taro Sano (Warwick)  Deformations of weak Fano manifolds (abs)
5.00 Michael Selig (Warwick)  Orbifold RiemannRoch in high dimensions (abs)

Oxford, Friday 26th April 2013
2.00 Andrew Chan (Warwick)  Gröbner Bases over Fields with Valuations (abs)
3.30 Matthew Pressland (Bath)  Labelled Seeds and Mutation Groups (abs)
5.00 Vittoria Bussi (Oxford)  Categorification of DonaldsonThomas invariants and of Lagrangian intersections (abs)

Cambridge, Thursday 21st February 2013
2.00 Mohammad Akhtar (Imperial): Mutations and Fano Varieties (abs)
3.30 Giulio Codogni (Cambridge): Curves, Jacobians and Modular Forms (abs)
5.00 Andrew Strangeway (Imperial): A Reconstruction Theorem for the Quantum Cohomology of Fano Bundles (abs)

Imperial College, Wednesday 5th December 2012
2.00 Andrea Fanelli (Imperial): Lifting Theorems in Birational Geometry (abs)
3.30 John Christian Ottem (Cambridge): Ample subschemes (abs)
5.00 Thomas Hawes (Oxford): GIT for nonreductive groups (abs)

Warwick Wednesday 10th Oct 2012
2.00 Igor Netay (HSE, Moscow)  On Ainfinity algebras of highest weight orbits (abs)
3.30 Andrew MacPherson (Imperial)  A NonArchimedean SYZConjecture(abs)
5.00 Andrey Trepalin (HSE, Moscow)  Rationality of the quotient of P^2 by a finite group of automorphisms over an arbitrary field of characteristic zero(abs)

Bath Thursday 31st May 2012
1.30 Pawel Borowka (Bath)  Nonsimple abelian varieties(abs)
3.00 Tom Sutherland (Oxford)  Affine cubic surfaces and cluster varieties(abs)
4.30 Anna Lena Winstel (FU Kaiserslauten)  The Relative Tropical Inverse Problem for Curves in a Fixed Plane(abs)

Warwick Thursday 8th March 2012 (WT1.04, Westwood)
1.30 Alex Collins (Bath)  Representations of quivers and weighted projective lines(abs)
3.00 Jørgen Rennemo (Imperial)  Göttsche's ExConjecture and the Hilbert Scheme of Points on a Surface(abs)
4.30 Taro Sano (Warwick)  Deformation theoretic approach to the classification of singular Fano 3folds(abs)

Oxford, Wednesday 26th October 2011 (RI.1.28, Gibson Building)
1.30 Tom Sutherland (Oxford)  Stability conditions for the onearrow quiver(abs)
3.00 John Christian Ottem (Cambridge)  Asymptotic cohomological functions (abs)
4.30 Ciaran Meachan (Edinburgh)  Moduli of Bridgelandstable objects(abs)

Imperial, Friday 1st April 2011 (Huxley Building)
12.00 Andrew MacPherson (Imperial)  Mirror Symmetry is Tduality (abs)
2.00 Alan Thompson (Oxford)  Models for Threefolds Fibred by K3 Surfaces of Degree Two (abs)
3.30 Will Donovan (Imperial)  The McKay Correspondence(abs)

Cambridge, Saturday 8th January 2011 (MR13, CMS)
2.00 Qiu Yu (Bath)  Stability space of quivers/species of two vertices (abs)
3.30 Alex Shannon (Cambridge)  Geometry without geometry(abs)

Bath, Thursday 9th December 2010 (Wolfson Lecture Theatre (4W 1.17))
1:30 Pawel Borowka (Bath)  An easy exercise or an open problem? (abs)
3.00 Umar Hayat (Warwick)  Gorenstein Quasihomogeneous Affine Varieties (abs)
4.30 Tarig Abdel Gadir (Glasgow)  [A^n /G] from the McKay quiver(abs) .

Warwick, Thursday 1st July 2010 (MS.03, Zeeman Building)
2.00 Pawel Borowka (Bath)  Abelian surfaces and genus 4 curves (abs)
3.45 YongJoo Shin (Sogang)  Classification of involutions on a surface of general type with p_g=q=0 (abs)

Glasgow, Monday 5th April 2010 (Maths Building)
10:30 Alan Thompson (Oxford)
Models for Ample <2>Polarised K3Fibrations
11:45 Dot Winn (Glasgow) 
Mori Dream Spaces and Moduli of Quiver Representations
12:30 Lunch
2:00 Joseph Grant (Bristol) 
SeidelThomas Twists and Derived Equivalences
2:50 Will Donovan (Imperial) 
Quantum systems and Representations

Oxford, Thursday 4th February 2010 (SR2 and Dartington House)
2.00 Jorge Vitoria (Warwick)  tstructures and coherent sheaves (abs) in SR2.
3.00 Tea in the Maths Common Room.
3.45 Yuhi Sekiya (Nagoya/Glasgow)  Moduli spaces of McKay quiver representations (abs) in Dartington House.

Imperial, Thursday 12th November 2009 ( Huxley Building, Room 408)
2:00 Ben Davison (Oxford)  Noncommutative DonaldsonThomas invariants.
3.15 Will Donovan (Imperial)  Tilting, derived categories and noncommutative algebras (abs)
4.30 Tea in the Maths Common Room.
5.00 Julian Holstein (Cambridge)  Preserving K(pi,1)'s  Hyperplane arrangements and homotopy type (abs) .

Cambridge, Thursday 14th May 2009
2:00 Carl McTague (Cambridge)  The Cayley plane genus.(abs)
3.30 David Holmes (Warwick)  Jacobians of hyperelliptic curves.(abs)
5.00 Alexander Shannon (Cambridge)  Twistor Dmodules.(abs)

Oxford, Thursday 5th March 2009 (Maths
Institute, SR2 and the Gibson Building)
1:00 Alan Thompson (Oxford) 
Degenerations of surfaces with Kodaira number zero
. (abs)
2:30 Hamid Ahmadinezhad (Kent) 
3fold flips and GIT
.
4:00 Dirk Schlueter (Oxford) 
DM stacks in toric geometry and moduli theory

Oxford, Thursday 30th October 2008 (Maths
Institute, SR1)
1:00 Nils Henry Rasmussen (Bergen / Warwick)  The dimension of W^1_d(C) where C is a smooth curve on a K3 surface .
3:00 Vicky Hoskins (Oxford)  An introduction to stacks. (abs)
4:00 Lisema Rammea (Bath)  Some interesting surfaces of general type in projective 4space
. (abs)

University of Kent, Canterbury, 67th March 2008 ( Institute of Mathematics, Statistics and Actuarial Science)
6th March
2:00 Jaroslaw Buczynski (Kent)  Linear sections of some Segre products.(abs)
3:30 Sohail Iqbal (Warwick)  Schubert Calculus.
5:00 Sarah Davis (Warwick)  Orbifold RiemannRoch and Curve Singularities
7th March
11:001:00 Workshop on Orbifold RiemannRoch led by Gavin Brown (Kent)
3:00 AnneSophie Kaloghiros (Cambridge)  The topology of some algebraic varieties

Oxford, Thursday 24th January 2008 (Maths
Institute, L3)
1:00 Stephen Coughlan (Warwick)  Constructions of surfaces of general type. Room L1
3:00 Sönke Rollenske (Imperial)  Some very nonKahler manifolds. (abs)Room L2
4:00 Elisa Tenni (Warwick)  Surface fibrations and their relative canonical algebras
. (abs) Room L3

Warwick, Thursday 22nd November 2007 ( Maths Institute, Room B3.02 )
1:00 Paul Cadman (Warwick)  Deformations of singularities and the intersection form. (abs)
(Move to room B3.01)
2:30 Lisema Rammea (Bath)  Construction of NonGeneral Type surfaces in P^4_w. (abs)
4:00 Alan Thompson (Oxford)  Tjurina and Milnor numbers of matrix singularities. (abs)

Oxford, Thursday 14th June 2007 (Maths
Institute, L3)
1:00 Nathan Broomhead (Bath)  The Dimer Model and CalabiYau Algebras. (abs)
3:00 Ed Segal (Imperial)  Superpotential algebras from threefold singularities. (abs)
4:00 Gergely Berczi (Budapest and Oxford)  Multidegrees of Singular Maps. (abs)

Imperial, Wednesday 21st February 2007 (Maths Institute, 53 Prince's Gate)
1:15 Jacopo Stoppa (Imperial): Stability and blowups. (abs)
2:30 AnneSophie Kaloghiros (Cambridge): The defect of terminal quartic 3folds. (abs)
(move to the Huxley Building, Room 540)
4:00 Alexander Kasprzyk (UNB): What little I know about Fake Weighted Projective Space .
(abs)

Bath, Friday 3rd November 2006 (1W 3.6)
1:15pm  Vladimir Lazic (Cambridge): Restricted volume function .
2:30pm  Michael Wemyss (Bristol): Singular Derived Categories and their application to geometry .
4:00pm  Alvaro Nolla de Celis (Warwick): GHilb and McKay correspondence .
(abs)

Oxford, Thursday 16th March 2006 (Maths
Institute, L3)
2:30 Ed Segal (Imperial): Crepant resolutions and quiver algebras . (abs)
4:00 Stephen Coughlan (Warwick): Graded rings in high codimension. (abs)

Imperial, Thursday 23 February 2006
1:00 Elizabeth Baldwin (Oxford): Moduli of stable maps as a GIT quotient. (abs)
3:00 Mark McLean (Cambridge): Symplectic Homology.

Oxford, Thursday 8th December 2005 (Maths
Institute, L3)
2:00 Nathan Broomhead (Bath): Cohomology of line bundles on toric varieties. (abs)
3:30 Alexander Kasprzyk (Bath): Recognising toric Fano singularities. (abs)

Imperial, Thursday 24th November 2005 (48 Princes Gardens, 'Board Room')
1:00 Ed Segal (Imperial): Operads and the Moduli of Curves. (abs)
3:00 Alex Paulin (Imperial): An Introduction to Rigid Geometry.

Warwick, Thursday 10th November 2005 (Maths Department,
B1.01/B3.02)
1:30 Alvaro Nolla de Celis (Warwick): Introduction to cyclic quotient singularities. (abs)
3:00 Stephen Coughlan (Warwick): Introduction to graded rings and varieties. (abs)

Oxford, Thursday 23rd June 2005 (Maths
Institute, L3)
12:00 Kyriakos Papadopoulos (Liverpool): Reflection Groups, Generalised Cartan Matrices & KacMoody
Algebras, Part I. (abs)
2:00 Kyriakos Papadopoulos (Liverpool): Reflection Groups, Generalised Cartan Matrices & KacMoody
Algebras, Part II. (abs)
3:00 John Wunderle (Liverpool): Properties of higher genus curves.
(abs)

Sheffield, Thursday 9th June 2005 (The Hicks Building, Lecture Theatre 3, Floor D)
1:00 David Stern (Sheffield): Vocabulary Made Easy. (abs)
3:00 David Stern (Sheffield): Tilting Tstructures, Mutating Exceptional Collections, Seiberg Duality... It's
all quivers to me. (abs)

Warwick, Thursday 26th May 2005 (Maths Department,
B3.03)
2:00 James Smith (Warwick): Introduction to K3 Surfaces: Part II. (abs)
3:30 Alexander Kasprzyk (Bath): Introduction to Toric Varieties: Part II. (abs)

Imperial, Thursday 10th March 2005 (Huxley Building, Room
139)
1:00 Shu Sasaki (Imperial): Crystalline Cohomology and Crystals. (abs)
2:00 & 3:15 Marco Lo Giudice (Bath): Schemetheoretic Projective Geometry. (abs)

Bath, Thursday 10th February 2005 (1W 3.20a)
1:00 Barrie Cooper (Bath): Koszul Duality and Twisted Group Algebras. (abs)
2:45 Elizabeth Baldwin (Oxford): Introduction to DeligneMumford Stacks: Part II. (abs)

Liverpool, Tuesday 25th January 2005 (Maths Department,
Room 211)
1:00 Kyriakos Papadopoulos (Liverpool): Reflection Groups of Integral Hyperbolic Lattices. (abs)
2:00 Grzegorz Kapustka & Michal Kapustka (Krakow): Some Geometric Properties of Singular Del Pezzo
Surfaces. (abs)
4:00 John Wunderle (Liverpool): Jacobians of Hyperelliptic Curves. (abs)
5:00 Alberto Besana (Milan): Symplectic Aspects of Framed Knots. (abs)

Oxford, Thursday 16th December 2004 (Maths
Institute, LR3)
2:00 Kenneth Shackleton (Southampton): Tightness and Computing Distances in the Curve Complex. (abs)
3:15 Cormac Long (Southampton): Some Results on Coxeter Groups. (abs)

Oxford, Tuesday 7th December 2004 (Maths
Institute, LR3)
12:00 & 3:00 Jonathan Kirby (Oxford): Model Theory and Geometry  An Introduction. (abs)
2:00 & 4:30 Barrie Cooper (Bath): An Introduction to Derived Categories. (abs)

Bath, Thursday 11th November 2004 (1W 3.24)
2:00 Alexander Kasprzyk (Bath): Introduction to Toric Varieties: Part I. (abs)
4:00 Elizabeth Baldwin (Oxford): Introduction to DeligneMumford Stacks: Part I. (abs)

Warwick, Thursday 28th October 2004 (Maths Department, B3.02 and B3.03)
12:00 James Smith (Warwick): Introduction to K3 Surfaces: Part I. (abs)
3:00 Marco Lo Giudice (Bath): Introduction to Schemes. (abs)

Bath, Thursday 10th June 2004 (1W 3.24)
2:00 Barrie Cooper (Bath): McKay Matrices, CFT Graphs, and Koszul Duality (Part I). (abs)
3:15 Michal Kapustka (Krakow): Linear Systems on a K3 Surface. (abs)
4:30 Grzegorz Kapustka (Krakow): Linear Systems on an Enriques Surface. (abs)

Cambridge, Monday 15th March 2004 (MR13, Geometry Pavilion (E))
2:00 Joel Fine (Imperial): Constant scalar curvature Kahler metrics on fibred complex
surfaces. (abs)
3:15 Gil Cavalcanti (Oxford): Massey products in Symplectic Geometry. (abs)
4:30 Chris Wuthrich (Cambridge): On padic heights in families of
elliptic curves. (abs)

Imperial, Thursday 26th February 2004 (Huxley Building, Room
140)
2:00 Daniel Hoyt (Cardiff): Braided categories and TQFTs. (abs)
3:15 Gil Cavalcanti (Oxford): Examples of generalized complex structures. (abs)
4:30 Oliver Nash (Oxford): An Introduction to Twistor Theory. (abs)

Oxford, Thursday 5th February 2004 (Maths Institute,
SR2)
2:00 Tim Browning (Oxford): Arithmetic of del Pezzo surfaces.
(abs)
3:15 James Smith (Warwick): K3s as quotients of symmetric surfaces. (abs)
4:30 Pierre Guillot (Cambridge): Algebraic cycles in the cohomology of finite groups. (abs)

Bath, Thursday 15th January 2004 (1W 3.24)
2:00 Marco Lo Giudice (Bath): Artin level algebras. (abs)
3:15 Jasbir Nagi (Cambridge): Graded Riemann spheres. (abs)
4:30 Jaroslaw Buczynski (Warsaw): Legendrian varieties. (abs)

Warwick, Thursday 11th December 2003 (Library Room 1)
2:00 Weronika Krych (Warsaw): False weighted projective spaces and Mori theorem for orbifolds. (abs)
3:15 Peter Frenkel (Budapest): Fixed point data of finite groups acting on 3manifolds. (abs)
4:30 Vivien Easson (Oxford): Applying algebraic geometry to 3manifold topology. (abs)
This page is maintained by Jørgen Rennemo (j.rennemo11@imperial.ac.uk).
