Chris Henson @_chenson__

CS PhD student @DrexelCCI working on categorical semantics in Lean. Collector of retro computers and vintage books. Formerly Quant Finance at Bank of America. chrishenson.net Philadelphia, PA Joined December 2014

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Chris Henson @_chenson__

2 days ago

Twitter has inexplicably decided to exclusively ask me about community notes written in French. I do read/follow some French accounts, but the majority of my interactions here are in English. I have to wonder how different components of the site infer a different primary language

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Chris Henson @_chenson__

3 days ago

Is there a name for the opposite of a forgetful functor? Today I unironically uttered the phrase "remembering functor" for this, further proof that category theory has rotted my brain.

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Chris Henson @_chenson__

a week ago

The best argument for Silksong being a Soulslike is people incessantly arguing about the use of NPCs in boss fights

S I L K N U A 🫧 @DNuatun

a week ago

The best argument for Silksong being a Soulslike is people incessantly arguing about the use of NPCs in boss fights

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José A. Alonso @Jose_A_Alonso

2 weeks ago

The groupoid-syntax of type theory is a set. ~ Thorsten Altenkirch, Ambrus Kaposi, Szumi Xie. arxiv.org/abs/2509.14988 #ITP #Agda

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Chris Henson @_chenson__

3 weeks ago

It's 3am. I jump out of bed, realizing I spent a week trying to do induction on the wrong term. Lean agrees, and now all is right with the world. (I will be exhausted today)

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José A. Alonso @Jose_A_Alonso

4 weeks ago

F91 in Lean. ~ Joachim Breitner. joachim-breitner.de/blog/817-F91_i… #ITP #LeanProver

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Chris Henson @_chenson__

a month ago

I've been trying to make this exact decision. Does anyone have experience with Framework laptops? After getting burned on unreliable System 76 hardware, I'm hesitant towards going for a newer company. For considering a modern Thinkpad, I was leaning towards the upper end P series

Lukáš Hozda @LukasHozda

a month ago

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Chris Henson @_chenson__

2 months ago

Tangentially related, but I think this is why Lean's typed metaprogramming system, while wonderful, is such a burden to learn. After a couple of years I still learn new functions every time I ask for help on the Zulip, and in contrast there aren't really primitives you can inline

Joseph Garvin @joseph_h_garvin

2 months ago

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Daniel Litt @littmath

2 months ago

@itaisher what definition of "AI tool" are you using here

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Joël Riou @jriou

3 months ago

My article on the "Formalization of derived categories in Lean/mathlib" is the first article afm.episciences.org/15978 in the first volume of the brand new journal Annals of Formalized Mathematics.

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Lean @leanprover

3 months ago

The first volume of the new Open Access journal "Annals of Formalized Mathematics" was released today! ➡️afm.episciences.org/volume/view/id… #FormalMath #Mathematics #OpenAccess

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Amar Hadzihasanovic @amar_hh

3 months ago

I am looking for a PhD student to join us in Tallinn!

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Chris Henson @_chenson__

3 months ago

I wrote a short blog post "The Interplay Between Metaprogramming and Computation in Lean": chrishenson.net/posts/2025-06-…

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PLDI @PLDI

3 months ago

Another award that is announced at PLDI is the SIGPLAN Programming Languages Software Award. This year, the award was received by the LEAN theorem prover (@leanprover), which has had and continues to have broad impact on mathematics, hardware and software verification, and AI!

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Tsung-Ju Chiang @tsungjuc

3 months ago

Our paper Multi-Stage Programming with Splice Variables, co-authored with @xnningxie, has been accepted to ICFP'25 😀! We designed a language for flexible, type-safe code generation, with advanced features like code pattern matching — enabled by what we call splice variables.