# tags

- ANAGRAMS (10)
- Fano (1)
- Stacks project (34)
- algebraic geometry (136)
- fortnightly links (173)
- fugue (2)
- meta (1)
- programming (83)
- teaching (2)

## ANAGRAMS

- Apr 20, 2016 The Brauer group of Brauer-Severi varieties
- Feb 24, 2015 Announcement for a seminar
- Nov 27, 2014 Examples of spectral sequences in algebra and algebraic geometry
- Oct 30, 2014 Visualisation of Schubert classes in Gr(2,4) and Gr(2,5)
- Oct 23, 2014 Three filtrations on the Grothendieck ring of a scheme
- Oct 09, 2014 What are Chern classes?
- Feb 23, 2014 Notes on depth and updates
- Jan 29, 2014 Notes on Riemann-Roch, Serre duality and Grothendieck duality
- Jan 29, 2014 Announcing a seminar
- Jan 16, 2014 A visualisation of Serre duality and Hodge diamonds

## Fano

- Mar 18, 2018 Golyshev's periodic table for Fano 3-folds of rank 1

## Stacks project

- Aug 16, 2023 Statistics for the Stacks project (2)
- Dec 08, 2022 Stacks Project Workshop 2023
- Jul 24, 2022 Stacks Project Expository Collection
- Jan 13, 2021 Introducing The Moduli Space
- Sep 09, 2020 The Stacks project in Nieuw Archief voor Wiskunde
- Apr 09, 2020 Statistics for the Stacks project
- Aug 09, 2019 Registration for the Stacks Project Workshop 2020
- Jul 16, 2019 A minimal working example to use Gerby
- Jun 21, 2019 Stacks Project Workshop 2020: website
- May 24, 2019 Stacks Project Workshop 2
- Oct 17, 2018 Introducing Kerodon
- May 21, 2018 A new website for the Stacks project (2)
- May 20, 2018 A website for Gerby
- Jan 05, 2018 Introducing Gerby: the tools and website
- Sep 11, 2017 The Stacks project now uses HTTPS
- Aug 27, 2017 Introducing Gerby: plasTeX
- Aug 09, 2017 The Stacks project workshop: the aftermath
- Jan 25, 2017 One week left to register for the Stacks project workshop
- Nov 08, 2016 Registration for the Stacks Project Workshop
- Oct 05, 2016 List of mentors for Stacks Project Workshop
- Sep 06, 2016 Stacks Project Workshop
- Jul 07, 2016 Stacks project website bug fixing
- Jul 02, 2016 Stacks project citations
- May 26, 2016 Alternative visualisation of the structure of the Stacks project
- Feb 03, 2016 The Stacks project has 5000 pages
- Dec 21, 2015 On "Towards MathJax 3.0"
- Jul 01, 2015 New feature for the Stacks project: detailed tag edits
- Jul 24, 2014 New feature for the Stacks project: slogans
- Apr 03, 2014 New feature for the Stacks project: references
- Jul 30, 2013 A new website for the Stacks project: the sequel
- Jan 07, 2013 An online bibliography for the Stacks project
- Dec 15, 2012 Online view for the Stacks project
- Jul 19, 2012 A new website for the Stacks project
- Nov 08, 2010 The Stacks Project

## algebraic geometry

- Feb 15, 2024 An update for Grassmannian.info: 2 big exceptional quantum spectra
- Nov 29, 2023 New papers: two papers on quiver moduli
- Sep 13, 2023 New paper: Hochschild cohomology of Hilbert schemes of points on surfaces
- Jul 14, 2023 The identification of a 6-dimensional Kronecker quiver moduli with a certain zero section
- Jul 07, 2023 GitHub Actions for automated unit tests of the Hodge diamond cutter
- Jul 06, 2023 New paper: On Chow rings of quiver moduli
- Feb 23, 2023 An update for Fanography.info: Bott vanishing
- Feb 01, 2023 Mgnbar.info: the geometry of the moduli space of (marked) curves
- Oct 04, 2022 New paper: Projectivity and effective global generation of determinantal line bundles on quiver moduli
- Sep 20, 2022 Videos and notes of Noncommutative Shapes
- Aug 22, 2022 An update for Grassmannian.info: higher Fanoness
- Aug 21, 2022 The periodic tables of algebraic geometry: 3-folds and beyond
- Aug 20, 2022 The periodic tables of algebraic geometry: curves and surfaces
- Aug 19, 2022 The periodic tables of algebraic geometry: introduction
- Aug 18, 2022 Updates for twisted Hodge diamonds for complete intersections
- Aug 03, 2022 New Oberwolfach report: Mirror symmetry for moduli of rank 2 bundles on a curve
- Jul 23, 2022 New-ish paper: Graph potentials and symplectic geometry of moduli spaces of vector bundles
- Jun 09, 2022 Noncommutative Shapes
- May 18, 2022 New Oberwolfach report: Projectivity of good moduli spaces of semistable quiver representations and vector bundles
- May 17, 2022 New-ish paper: Graph potentials and topological quantum field theories
- May 11, 2022 New-ish paper: Decompositions of moduli spaces of vector bundles and graph potentials
- Feb 18, 2022 New paper: Homological projective duality for the Segre cubic
- Oct 22, 2021 Some comments on hyperplane sections of generalised Grassmannians
- Sep 15, 2021 Noncommutative Shapes: a half-way event
- Sep 01, 2021 Hyperkaehler.info: the geography of irreducible holomorphic symplectic (or hyperkähler) varieties
- Aug 06, 2021 Clean URLs for Grassmannian.info and Fanography
- Aug 05, 2021 Documentation and unit tests for the Hodge diamond cutter
- Jul 08, 2021 Follow-up on $\int\mathrm{td}_X^{1/2}$ for hyperkähler varieties
- Jul 06, 2021 On $\int\mathrm{td}_X^{1/2}$ of O'Grady's exceptional hyperkähler varieties
- Mar 21, 2021 Seshadri's desingularisation in the Hodge diamond cutter, and a bold proposal
- Mar 06, 2021 Fano 3-folds in the Hodge diamond cutter
- Mar 05, 2021 Quiver moduli in the Hodge diamond cutter
- Feb 24, 2021 An update for Grassmannian.info: quantum spectra for horospherical varieties
- Feb 23, 2021 Horospherical varieties on Grassmannian.info
- Feb 14, 2021 Horospherical varieties in the Hodge diamond cutter
- Jan 11, 2021 An overview of what the names Pieri, Giambelli, Chevalley, Monk, Littlewood–Richardson say about the cohomology of $G/P$
- Dec 29, 2020 An update for Fanography.info: description as zero sections of homogeneous vector bundles
- Dec 03, 2020 An update for Grassmannian.info: more quantum spectra!
- Nov 29, 2020 An update for Grassmannian.info: spectra of quantum multiplication with $\mathrm{c}_1$
- Nov 20, 2020 An update for Fanography.info: semisimplicity of quantum cohomology
- Nov 06, 2020 An update for Grassmannian.info: semisimplicity of quantum cohomology
- Oct 28, 2020 Two additions to the Hodge diamond cutter
- Oct 26, 2020 Pictures of the canonical strip hypothesis for moduli of vector bundles
- Sep 29, 2020 Interpreting skew conics
- Sep 14, 2020 New preprint: Graph potentials and moduli spaces of rank two bundles on a curve
- Jul 03, 2020 New preprint: Indecomposability of derived categories in families
- Jun 16, 2020 A DOI for the Hodge diamond cutter
- May 29, 2020 An update for Grassmannian.info: exceptional collections
- May 22, 2020 An update for Grassmannian.info: Freudenthal's magic square and pages for root system data
- May 16, 2020 An update for Grassmannian.info: pages for each Grassmannian
- May 08, 2020 Grassmannian.info: a periodic table for Grassmannians
- May 06, 2020 New preprint: Derived categories of the Cayley plane and the coadjoint Grassmannian of type F
- Dec 12, 2019 le superficie algebriche: an update
- Nov 06, 2019 New tool: twisted Hodge diamonds for complete intersections
- Oct 29, 2019 A caveat on the notion of strongly simple
- Oct 07, 2019 Belgian–Dutch algebraic geometry day in Antwerp
- Jul 15, 2019 Fanography: del Pezzo surfaces
- Jul 08, 2019 Hodge numbers for Quot schemes on curves
- May 09, 2019 Hodge numbers for O'Grady 10
- Jan 27, 2019 New tool: Hodge diamond cutter
- Jan 16, 2019 Hodge numbers for Hilbert squares and Hilbert cubes
- Jan 04, 2019 Hodge numbers for partial flag varieties
- Jan 03, 2019 Fanography: updates
- Dec 26, 2018 Roots of Hilbert polynomials for Fano toric varieties
- Nov 22, 2018 Hodge diamonds and polyvector parallelograms
- Nov 01, 2018 Hodge numbers for generalised Kummer varieties
- Oct 15, 2018 Fanography: a tool to visually study the geography of Fano 3-folds
- Aug 23, 2018 Index of partial flag varieties
- Aug 22, 2018 Rank of the Grothendieck group of partial flag varieties
- Aug 14, 2018 Hilbert squares of higher-dimensional hyperkähler varieties are not hyperkähler
- Jun 15, 2018 Brill–Noether pictures
- Mar 18, 2018 Golyshev's periodic table for Fano 3-folds of rank 1
- Jan 27, 2018 Hodge numbers for complete intersections
- Jan 21, 2018 Hodge numbers for $\operatorname{M}_C(r,\mathcal{L})$
- Nov 18, 2017 Hodge numbers for $\operatorname{Hilb}^nS$
- Sep 13, 2017 Open access journals in algebraic geometry
- Jun 14, 2017 Dimensions of partial flag varieties
- Apr 09, 2017 On Bondal's counterexample to the Jordan-Hölder property: non-extendability
- Apr 08, 2017 On Bondal's counterexample to the Jordan-Hölder property: exceptionality
- Nov 30, 2016 Improved open and closed immersions in tikz-cd
- Nov 21, 2016 Gorenstein weighted projective spaces and Egyptian fractions
- Oct 11, 2016 The great debate: is it del Pezzo or Del Pezzo?
- Oct 03, 2016 According to Groth. IV.22
- Sep 25, 2016 Live blogging the Antwerp conference (3)
- Sep 22, 2016 Live blogging the Antwerp conference (2)
- Sep 20, 2016 Live blogging the Antwerp conference
- Sep 11, 2016 Is it the Cartan, Coxeter or Gram matrix?
- Aug 18, 2016 Two fuzzy projective lines
- Aug 14, 2016 When is an algebraic geometer skilful enough?
- Jul 31, 2016 Announcing ncag.info
- Jul 05, 2016 When is D(Qcoh X) compactly generated by a single perfect complex?
- May 22, 2016 On a conjecture by Novakovic
- May 11, 2016 New paper: Noncommutative quadrics and Hilbert schemes of points
- Apr 20, 2016 The Brauer group of Brauer-Severi varieties
- Feb 09, 2016 Genera of complete intersection curves
- Jan 26, 2016 Nonrationality of the generic cubic fourfold
- Dec 28, 2015 Algebraic geometry fun facts for the festivities: Enriques surfaces are never complete intersections
- Dec 27, 2015 Algebraic geometry fun facts for the festivities: genera of complete intersection curves
- Dec 26, 2015 Algebraic geometry fun facts for the festivities: direct products of quasicoherent sheaves are not exact
- Dec 25, 2015 Algebraic geometry fun facts for the festivities: absolute flatification
- Dec 24, 2015 Algebraic geometry fun facts for the festivities: cohomology vanishing
- Dec 23, 2015 "Look ma, no Hodge theory"
- Sep 05, 2015 Excellent notes on algebraic stacks
- Aug 19, 2015 What makes the Kronecker quiver special?
- Aug 16, 2015 Cohomology tables in Macaulay2
- Jul 29, 2015 A map of Calabi--Yau 3-folds
- Jul 15, 2015 le superficie algebriche
- Mar 09, 2015 Works of Sasha Rosenberg
- Mar 01, 2015 A new map of Spec Z[x]
- Nov 27, 2014 Examples of spectral sequences in algebra and algebraic geometry
- Nov 06, 2014 Software for computations in algebraic geometry
- Oct 30, 2014 Visualisation of Schubert classes in Gr(2,4) and Gr(2,5)
- Oct 30, 2014 On rational surface singularities
- Oct 23, 2014 Three filtrations on the Grothendieck ring of a scheme
- Oct 16, 2014 Only five smooth projective toric Fano surfaces
- Oct 09, 2014 What are Chern classes?
- Aug 01, 2014 Comparison of topologies
- Jun 17, 2014 New version of Hodge diamonds and Serre duality tables for complete intersections
- Jun 13, 2014 Table of contents for Thomason--Trobaugh
- Jun 07, 2014 Phantom categories do exist
- Apr 04, 2014 Do phantom categories exist?
- Mar 22, 2014 Serre's diagonal trick
- Mar 05, 2014 Noncommutative geometry on the arXiv
- Jan 29, 2014 Notes on Riemann-Roch, Serre duality and Grothendieck duality
- Jan 16, 2014 A visualisation of Serre duality and Hodge diamonds
- Dec 31, 2013 The fppf topology is generated by Zariski coverings and surjective finite locally free morphisms
- Nov 14, 2013 Possible noncommutative progress on the standard conjectures
- May 24, 2013 Every projective variety is a quiver Grassmannian: the algorithm
- Apr 20, 2013 Autour de la Géométrie Algébrique Dérivée
- Mar 13, 2013 Open and closed immersions in tikz-cd
- Feb 09, 2013 GAGA in 24+epsilon tweets
- Mar 27, 2012 Enumerating all matrices in Jordan normal form
- Aug 17, 2011 Solution's to Vakil's Foundations of Algebraic Geometry
- Jun 19, 2011 Solutions to Tennison's Sheaf theory
- May 25, 2011 A LaTeX version of Mumford's impression of Spec Z[x], or some TikZ tricks
- May 08, 2011 An algorithm to determine the intersection multiplicity of two curves

## fortnightly links

- Feb 14, 2024 Fortnightly links (173)
- Sep 04, 2023 Fortnightly links (172)
- Aug 06, 2023 Fortnightly links (171)
- Jul 03, 2023 Fortnightly links (170)
- May 17, 2023 Fortnightly links (169)
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- Jan 09, 2023 Fortnightly links (164)
- Dec 19, 2022 Fortnightly links (163)
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- Sep 19, 2022 Fortnightly links (157)
- Aug 30, 2022 Fortnightly links (156)
- Aug 15, 2022 Fortnightly links (155)
- Jul 31, 2022 Fortnightly links (154)
- Jul 22, 2022 Fortnightly links (153), part 2
- Jul 21, 2022 Fortnightly links (153), part 1
- May 12, 2022 Fortnightly links (152)
- Apr 26, 2022 Fortnightly links (151)
- Mar 28, 2022 Fortnightly links (150)
- Mar 06, 2022 Fortnightly links (149)
- Feb 20, 2022 Fortnightly links (148)
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- Jan 25, 2021 Fortnightly links (121)
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- Dec 24, 2020 Fortnightly links (119)
- Dec 07, 2020 Fortnightly links (118)
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- Oct 25, 2020 Fortnightly links (116)
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- Feb 11, 2018 Fortnightly links (55)
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- Jan 01, 2018 Fortnightly links (52)
- Dec 17, 2017 Fortnightly links (51)
- Dec 04, 2017 Fortnightly links (50)
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- Jul 23, 2017 Fortnightly links (40) and (41)
- Jun 25, 2017 Fortnightly links (39)
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- Dec 26, 2016 Fortnightly links (26)
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- Aug 07, 2016 Fortnightly links (16)
- Jul 23, 2016 Fortnightly links (15)
- Jul 10, 2016 Fortnightly links (14)
- Jun 26, 2016 Fortnightly links (13)
- Jun 12, 2016 Fortnightly links (12)
- May 29, 2016 Fortnightly links (11)
- May 15, 2016 Fortnightly links (10)
- May 01, 2016 Fortnightly links (9)
- Apr 17, 2016 Fortnightly links (8)
- Apr 03, 2016 Fortnightly links (7)
- Mar 20, 2016 Fortnightly links (6)
- Mar 06, 2016 Fortnightly links (5)
- Feb 21, 2016 Fortnightly links (4)
- Feb 07, 2016 Fortnightly links (3)
- Jan 24, 2016 Fortnightly links (2)
- Jan 10, 2016 Fortnightly links

## fugue

- May 20, 2017 Fugue and the guitar
- Mar 25, 2017 Nikita Koshkin's 24 preludes and fugues are now published

## meta

## programming

- Feb 15, 2024 An update for Grassmannian.info: 2 big exceptional quantum spectra
- Feb 23, 2023 An update for Fanography.info: Bott vanishing
- Feb 01, 2023 Mgnbar.info: the geometry of the moduli space of (marked) curves
- Aug 22, 2022 An update for Grassmannian.info: higher Fanoness
- Aug 18, 2022 Updates for twisted Hodge diamonds for complete intersections
- Sep 01, 2021 Hyperkaehler.info: the geography of irreducible holomorphic symplectic (or hyperkähler) varieties
- Feb 24, 2021 An update for Grassmannian.info: quantum spectra for horospherical varieties
- Dec 29, 2020 An update for Fanography.info: description as zero sections of homogeneous vector bundles
- Dec 03, 2020 An update for Grassmannian.info: more quantum spectra!
- Nov 29, 2020 An update for Grassmannian.info: spectra of quantum multiplication with $\mathrm{c}_1$
- Nov 20, 2020 An update for Fanography.info: semisimplicity of quantum cohomology
- Nov 06, 2020 An update for Grassmannian.info: semisimplicity of quantum cohomology
- Oct 26, 2020 Pictures of the canonical strip hypothesis for moduli of vector bundles
- Jun 16, 2020 A DOI for the Hodge diamond cutter
- May 29, 2020 An update for Grassmannian.info: exceptional collections
- May 22, 2020 An update for Grassmannian.info: Freudenthal's magic square and pages for root system data
- May 16, 2020 An update for Grassmannian.info: pages for each Grassmannian
- May 08, 2020 Grassmannian.info: a periodic table for Grassmannians
- Dec 21, 2019 Gerby supports TikZ now
- Dec 12, 2019 le superficie algebriche: an update
- Nov 06, 2019 New tool: twisted Hodge diamonds for complete intersections
- Jul 16, 2019 A minimal working example to use Gerby
- Jul 15, 2019 Fanography: del Pezzo surfaces
- Jan 27, 2019 New tool: Hodge diamond cutter
- Jan 16, 2019 Hodge numbers for Hilbert squares and Hilbert cubes
- Jan 04, 2019 Hodge numbers for partial flag varieties
- Jan 03, 2019 Fanography: updates
- Dec 26, 2018 Roots of Hilbert polynomials for Fano toric varieties
- Nov 01, 2018 Hodge numbers for generalised Kummer varieties
- Oct 15, 2018 Fanography: a tool to visually study the geography of Fano 3-folds
- May 20, 2018 A website for Gerby
- Jan 27, 2018 Hodge numbers for complete intersections
- Jan 21, 2018 Hodge numbers for $\operatorname{M}_C(r,\mathcal{L})$
- Jan 05, 2018 Introducing Gerby: the tools and website
- Nov 18, 2017 Hodge numbers for $\operatorname{Hilb}^nS$
- Aug 27, 2017 Introducing Gerby: plasTeX
- Nov 30, 2016 Improved open and closed immersions in tikz-cd
- Nov 05, 2016 Announcing bibgetter
- Oct 24, 2016 Aligning table columns on a mathematical operator
- Aug 30, 2016 Computing relations in Jacobi algebras
- Aug 16, 2015 Cohomology tables in Macaulay2
- Jul 15, 2015 le superficie algebriche
- Nov 24, 2014 Nitpicking on Čech cohomology notation
- Nov 11, 2014 How do I properly cite a preprint in `biblatex`?
- Nov 06, 2014 Software for computations in algebraic geometry
- Aug 01, 2014 Comparison of topologies
- Jun 17, 2014 New version of Hodge diamonds and Serre duality tables for complete intersections
- Jan 16, 2014 A visualisation of Serre duality and Hodge diamonds
- Nov 27, 2013 Modular group algebras of finite representation type
- May 24, 2013 Every projective variety is a quiver Grassmannian: the algorithm
- Mar 13, 2013 Open and closed immersions in tikz-cd
- Feb 04, 2013 Categories for todos
- Jun 21, 2012 Some trivia on derived subgroups
- Apr 20, 2012 A Pygments lexer for GAP
- Mar 27, 2012 Enumerating all matrices in Jordan normal form
- Feb 09, 2012 A beamer theme for the University of Ghent
- Dec 18, 2011 Alternating beams for semi-quavers in Lilypond
- Dec 14, 2011 Changing \href{}{} to produce footnotes
- Nov 04, 2011 \uparrow and its variations are variable-sized delimiters
- Aug 27, 2011 An update to dutch.lbx in babelbib
- Aug 24, 2011 How to use \thanks in memoir's titlingpage
- Aug 18, 2011 Development of the Fuxian counterpoint project is now available at GitHub
- Aug 16, 2011 Installing Strasheela
- Jul 05, 2011 Guest post: Inheritance in Pygments' LatexFormatter
- May 25, 2011 A LaTeX version of Mumford's impression of Spec Z[x], or some TikZ tricks
- May 08, 2011 An algorithm to determine the intersection multiplicity of two curves
- Mar 15, 2011 A correct implementation of the Dutch language in babelbib
- Mar 06, 2011 How to change Pygments styles and a University of Antwerp style
- Feb 26, 2011 Relative paths in multiple documents
- Feb 20, 2011 Why LaTeX beamer needs fragile when using verbatim
- Dec 27, 2010 An H-tree in TikZ
- Dec 24, 2010 An extension to our \function macro: injective and surjective functions using optional parameters
- Dec 18, 2010 My good practice concerning inline mathematical formulas
- Dec 15, 2010 \twoheadrightarrow is in amssymb
- Dec 15, 2010 How to let a command automatically adapt to the current mathematical style
- Dec 12, 2010 A Turing machine in LaTeX: the follow-up
- Dec 06, 2010 The power of \mathclap (and \substack)
- Nov 28, 2010 Wiggly text marker lines in TeX
- Nov 16, 2010 Caveat: correct spacing in quotient
- Nov 13, 2010 Automated handling of whitespace in commands using xspace
- Nov 11, 2010 Howto: Draw algebraic curves using PGF/TikZ
- Nov 01, 2010 How to make the TikZ option raw output aware of segments
- Oct 24, 2010 Polynomial division

## teaching

- Apr 09, 2018 My course on Hochschild (co)homology starts tomorrow
- Feb 01, 2018 Course announcement: Hochschild (co)homology