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Surely there must be a more elegant formulation than that of Mochizuki of an arithemetic Frobenioid, some commenters on google+ pointed out this week. Here, a feeble attempt on my part.

Welcome back to the second episode in the stills-YouTube-channel MinuteMochizuki. Today we will dismantle not just one scheme, but a simple cover of arithmetic schemes and replace it by a

Quadratic Arithmetic Frobenioid

This week on G+ i said i'd better set-up a YouTube channel MinuteMochizuki (mimicking MinutePhysics) but it's way quicker to doodle a few things, instant-upload a snap-shot and add some explanation. But, there's only that much math one can cram into a G+ post, so i will try to cross-post here.

For me this quest is over. All i did was following breadcrumbs left by others.

Fellow-travelers arrived there before. What did they do next?

Roy Lisker (remember him from the Mormoiron post?) has written up his Grothendieck-quest(s), available for just 23$, and with this strange blurb-text:

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We would love to conclude this series by finding the location of the "final" Grothendieck-spot, before his 85th birthday, this thursday.

But, the road ahead will be treacherous, with imaginary villages along the way and some other traps planted by the nice people of the Grothendieck Fan Club

Before we start the quest for the final G-spot, hopefully in time for Grothendieck's 85th birthday, one more post on Alexandre's 'hippy-days'.

One week from now, Alexandre Grothendieck will turn 85. Today, we'll have a glance at his 'wilder years', the early 70ties, when he resigned from the IHES and became one of the leading figures in the French eco-movement. This iconic picture is from those days

The text reads:

"Schurik entre les "frères ennemis" Gaston Galan et Dyama, rue Polonceau.

Derrière, Chantal et Motito (femme et fille de Gaston)."

With Grothendieck's 85th brithday coming up, march 28th, we continue our rather erratic quest to locate the spots that once meant a lot to him.

Ever wondered what Grothendieck's last-known hideout looked like? Well, here's the answer:

(h/t gruppe eM)

And, here's the story.

In a couple of days, on march 28th, Alexandre Grothendieck will turn 85.

To mark the occasion we'll run a little series, tracking down places where he used to live, hoping to entice some of these villages in the south of France to update their Wikipedia-page by adding under 'Personnalités liées à la commune' the line

- Alexandre Grothendieck (né en 1928), mathématicien français ayant reçu la Médaille Fields.