Archive

2023

• Dec 17Gluing manifolds along boundaries
• Jul 18Looking back on the Problem Selection Committee
• Jun 25μ-filtrations
• Jan 23How to teach cohomology to kiddies

2022

• Dec 26Linear algebra through pictures

2020

• Apr 22Solving Hartshorne exercises
• Apr 19How to sheafify in one go

2018

• Oct 03Eliminating aperiodicity in tilings
• Aug 27A rough guide to linear algebra
• Aug 23Maxwell's equations
• Apr 21Tate's thesis 2: global zeta functions
• Apr 15Tate's thesis 1: local zeta functions
• Mar 20Dwyer–Kan localization
• Jan 14Faisceaux Algébriques Cohérents 5 – Serre duality
• Jan 13Faisceaux Algébriques Cohérents 4 – Coherent sheaves
• Jan 12Faisceaux Algébriques Cohérents 3 – coherent sheaves on projective space
• Jan 11Faisceaux Algébriques Cohérents 2 – Čech cohomology
• Jan 09Faisceaux Algébriques Cohérents 1 – sheaf cohomology

2017

• Dec 07Witt vectors
• Aug 18Torus actions on symplectic manifolds I
• Jul 31The CGWH category
• Jul 14A Ramsey game
• Mar 21What on earth is... topological K-theory?
• Jan 19Squares on curves

2016

• Dec 18The Lefschetz fixed-point formula
• Nov 17The Banach–Tarski paradox

2015

• Dec 12Base-free interpretation of the fundamental group via groupoids