# Motivic Homotopy Theory seminar — Spring 2015

## Organization

Organization
Johan Commelin and Joost Nuiten
Location
See below
Time
1500–1700, Wednesday (exceptions: see below)

## Description

This is a crash course in the form of a seminar on Motivic Homotopy Theory (MHT) to prepare ourselves for the lectures on $\mathbb{A}^1$-homotopy theory in the upcoming GQT-colloquium in the first week of June.

We follow the book by Dundas, e.a., Motivic Homotopy Theory. Universitext 2007.

MHT is a mix of algebraic topology and algebraic geometry. Since there is not that much time, the pace will be rather high. Therefore the algebraic topologists will give talks on topics that they are familiar with, whilst the algebraic geometers will talk about topics in their field. In other words, the goal is not so much to learn a lot from your own talk (as might be the case in other seminars), but to enlighten fellow mathematicians from a nearby field.

## Schedule and location

DateRoomTalks
Wed, Apr 1500.308 Johan Commelin — Intro to schemes. Notes
Joost Nuiten — Simplicial sets, etc.
Wed, Apr 2200.308 Ben Moonen — Examples; Groups schemes; Functor of points.
Javier Gutiérrez — Model categories.
Fri, May 100.065 Milan Lopuhaä — Finite; proper; flat.
Matan Prasma — Constructions in model categories.
Wed, May 603.632 Johan Commelin — Smooth and étale morphisms. Notes
Simon Henry — Pretopologies, étale site, Nisnevich site.
Tue, May 1200.086 Giovanni Caviglia — Bousfield localization; simplicial model categories.
Joost Nuiten — Model structure on simplicial presheaves; $\mathbb{A}^{1}$-model structure.
Wed, May 2000.308 Milan Lopuhaä — Tate object.
Javier Gutiérrez — Spectra.
Wed, May 2700.086 Joost Nuiten — Model structure for motivic spectra.
Johan Commelin — Motivic cohomology. Notes

## Literature

The main source is the aforementioned book by Dundas, e.a., Motivic Homotopy Theory. Universitext 2007.

Brian Osserman has created two cheat sheets about properties of morphisms and properties of properties of morphisms.

For more information about weights (and Tate objects) in the cohomology of algebraic varieties, see the 6 page long article by P. Deligne, Theorie de Hodge I, Actes du Congrès International des Mathématiciens (Nice, 1970), Tome 1, pp. 425–430. Gauthier-Villars, Paris, 1971. (Also available online via his list of publications on the IAS website.)