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Meven Lennon-Bertrand

@mevenlennonbertrand@lipn.info
mastodon 4.5.3

Post-doc at INRIA/IRIF/Université Paris Cité.

I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad.

Profile banner (from the Leonard comic by Turk & de Groot):
- I wanted to serve science because it it my joy and instead of that, what am I doing?...
- Yes, what is he doing?
- I guess he's complaining!

0 Followers
0 Following
Joined April 22, 2024
web page:
https://www.meven.ac/
proof assistants stack exchange:
https://proofassistants.stackexchange.com/users/367/meven-lennon-bertrand
github:
https://github.com/MevenBertrand/
pronouns:
he/they/anything really

Posts

mevenlennonbertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
Meven Lennon-Bertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
@mevenlennonbertrand@lipn.info · Mar 05, 2026

Did you know: the only image of Michel Rolle available on the internet is, in fact, a low resolution picture of Leibnitz.

(Rolle is known by every French math student because the standard construction of analysis here goes through the theorem named after him, is it one of those cases where we're the only ones doing it this way or is the guy actually famous?)

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mevenlennonbertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
Meven Lennon-Bertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
@mevenlennonbertrand@lipn.info · Mar 04, 2026

RE: @arXiv_csLO_bot@mastoxiv.page

Lately I've embarked on a fun side quest in proof theory. Where I managed to still bump into bidirectional typing! (To an old dog everything looks like a nail, that's the saying right?)

I learned bidirectionalism is very much related to the subformula property, a proof theory idea that had always seemed mysterious to me. Now I understand why proof theorists rave about cut elimination and the subformula property, which is the same as why bidirectionalism is so useful for proofs: information flow! Also the coincidence between normal forms and terms having good bidirectional typing seems less miraculous: it's essentially the same thing as cut-free proofs having the subformula property.

So anyway, interpolation is a cute property, but I learned a surprising amount about type theory while looking at it! Hope you will too.

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mevenlennonbertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
Meven Lennon-Bertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
@mevenlennonbertrand@lipn.info · Mar 02, 2026

The time has come: Claude is able to poke holes in the dark corners of Rocq's kernel and come up with proofs of False!

The days of "our reasonable users use the unreasonable features only in reasonable ways so it's ok to have them" really are over. Can't wait until someone vibe codes a complicated proof without looking too closely at it (since it's been checked by the kernel, it must be fine!) only to later realise it was actually bogus and such a bug without the agent saying so...

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mevenlennonbertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
Meven Lennon-Bertrand
Meven Lennon-Bertrand
@mevenlennonbertrand@lipn.info

Post-doc at INRIA/IRIF/Université Paris Cité. I mostly try to convince proof assistants that they are doing reasonable things. Sometimes this involves studying type theory. Sometimes this means understanding what our implementations do. All in all, it's not too bad. Profile banner (from the Leonard comic by Turk & de Groot): - I wanted to serve science because it it my joy and instead of that, what am I doing?... - Yes, what is he doing? - I guess he's complaining!

lipn.info
@mevenlennonbertrand@lipn.info · Jan 07, 2026

Looks like the ACM's AI summaries are still the only thing appearing whenever you do a search… How do we need to say it!?

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