# Fortnightly links (117)

Amnon Neeman: New progress on Grothendieck duality, explained to those familiar with category theory and with algebraic geometry has a self-explanatory title. I approve of the title, and the content of the paper, as it beautifully describes aspects one of my first loves in mathematics.

With the notion of a blogroll gone out of fashion for many, many years by now, I can amplify Picture This Maths via these fortnightly links. They write very visually attractive blog posts!

Christian Böhning, Hans-Christian Graf von Bothmer, Roberto Pignatelli: A rigid, not infinitesimally rigid surface with K ample has another self-explanatory title. What is unfortunate is that we can't add it to superficie.info, because $\mathrm{c}_1^2=1260966$ and $\mathrm{c}_2=560658$ is slightly out of what we can display!