### lieven lebruyn

Shared publicly -**Maltsiniotis' talk on Grothendieck's Lasserre-gribouillis**#Grothendieck

Yesterday, George Maltsiniotis gave a talk at the Gothendieck conference in Montpellier with title "Grothendieck's manuscripts in Lasserre" [1].

This morning, +David Roberts asked for more information on its content, and earlier i gave a short reply on what i learned [2], but perhaps this matter deserves a more careful write-up.

+Damien Calaque attended George's talk and all info below is based on his recollections. Damien stresses that he didn't take notes so there might be minor errors in the titles and order of the parts mentioned below.

EDIT: based on info i got from +Pieter Belmans in the comments below (followed up by the picture he got via +Adeel Khan taken by Edouard Balzin) i've corrected the order and added additional info.

The talk was videotaped and should become public soon.

As i mentioned last week [3] Grothendieck's family has handed over all non-family related material to the Bibliotheque Nationale. Two days ago, Le Monde wrote [4] that the legacy consists of some 50.000 pages.

Maltsiniotis insisted that the BNF wants to make these notes available to the academic community, after they made an inventory (which may take some time).

I guess from the blackboard-picture i got from Pieter, the person responsible at the BNF is Isabelle le Masme de Chermont [7].

The Lasserre-griboillis themselves consists of 5 parts:

1. Géométrie élémentaire schématique. (August 1992)

This is about quadratic forms and seems to be really elementary.

2. Structure de la psyché. (12/10/1992-28/09/1993) 3600 pages

This one is about some combinatorics of oriented graphs with extra-structure (part of the structure are successor and predecessor operators on the set of arrows).

3. Psyché et structures (26/03/93-20/06/93) 700 pages

This one is non-mathematical.

4. Maxwell equations.

Maltsiniotis mentioned that he was surprised to see that there was at best one mathematics book in G's home, but plenty of physics books.

5. Le problème du mal. (1993-1998)

This one is huge (30.000 pages) and is non-mathematical.

Note that also the Mormoiron-gribouillis will be made public by the University of Montpellier, [5] or if you prefer video [6].

Finally, is the photo below what you think it is? Yep!

[1] : http://www.i3m.univ-montp2.fr/files/COMM/GROTHENDIECK/GROTHENDIECK2015schedule.pdf

[2] : https://plus.google.com/+DavidRoberts/posts/Nn5CxhFudrZ

[3] : https://plus.google.com/+lievenlebruyn/posts/eUikTH73JBg

[4] : http://www.lemonde.fr/sciences/article/2015/06/17/des-milliers-de-manuscrits-du-genie-des-maths-alexandre-grothendieck-bientot-numerises_4656174_1650684.html

[5] : http://www.liberation.fr/sciences/2015/06/17/les-gribouillis-d-alexandre-grothendieck-enfin-sauvegardes_1331465

[6] : http://france3-regions.francetvinfo.fr/languedoc-roussillon/2015/06/17/les-notes-manuscrites-d-alexander-grothendieck-seront-archivees-montpellier-750077.html

[7] : http://www.bnf.fr/documents/organigramme.pdf

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Thomas R.

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Do you know where one finds the videos?

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