# Author Archives: xenaproject

## Lean 2022 round-up

A brief survey post containing some of the things which happened in the Lean community in 2022. The Liquid Tensor Experiment In December 2020, Fields Medallist Peter Scholze challenged the formal computer proof community to verify one of his theorems … Continue reading

## Beyond the Liquid Tensor Experiment

The liquid tensor experiment is now fully completed. Continue reading

## The Future of Interactive Theorem Proving?

This is a guest post, written by Zhangir Azerbayev. Zhangir is an undergraduate at Yale, majoring in computer science and mathematics. He completed this work while visiting Carnegie Mellon’s Hoskinson Center for Formal Mathematics. Introduction The history of interactive theorem … Continue reading

## Teaching formalisation to mathematics undergraduates

It’s been a hectic 2022 so far, but August is looking a lot calmer; this is the first of hopefully a few blog posts this month catching up on various things. In this post I want to talk about the … Continue reading

## 2022 Xena Project undergraduate workshop

I have funding to run an undergraduate workshop! When? 26th to 30th September 2022 (the week before term starts for many people in the UK). What? A week-long in person workshop including a bunch of working on group projects in … Continue reading

## New year, new teaching material

Imperial College has gone back to in-person teaching so I have 250 new subjects to experiment on, namely the new 1st year maths undergraduates. I’ve spent a few years now trying to figure out how best to teach maths undergraduates … Continue reading

## 2021 Xena Summer Projects

So I spent July and August supervising mathematics undergraduates who were doing Lean projects in various areas of mathematics. Conformal maps, Euclid’s SAS theorem, nilpotent groups and the Radon-Nikodym theorem are just some of the topics I’ve been engaging with … Continue reading

## Half a year of the Liquid Tensor Experiment: Amazing developments

[This is a guest post by Peter Scholze.] Exactly half a year ago I wrote the Liquid Tensor Experiment blog post, challenging the formalization of a difficult foundational theorem from my Analytic Geometry lecture notes on joint work with Dustin … Continue reading

## The trace of an endomorphism (without picking a basis)

Did you pick a basis when doing a linear algebra question about finite-dimensional vector spaces? Did you need to? Depends on what you mean. Continue reading

## Induction on equality

In type theory, equality has a definition, and basic facts about it such as symmetry and transitivity can be proved from more fundamental principles. Continue reading