Around Fontaine’s Period Rings
Published:
‘I live my life in widening rings…’
Blog posts
2025
Hensel’s Proof of the Transcendence of e
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In 1905, Hensel provided the following proof about the transcendence of \(e\).
2020
The linear algebra of Page-Rank
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The linear algebra of google Page-Rank algorithm is essentially a fixed point formula. Let me sketch how it works. This is an interesting application of linear algebra, graph theory and probability.
2017
Serre-Tate for 1-motives
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This post is an overview of the article arXiv:1704.01340 written with A. Bertapelle.
2016
From Poincaré’s Lemma to Volterra’s Theorem
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‘A Forgotten Turning‑Point in the History of Differential Forms from this paper of Hans Samelson ‘