This is the home page of the Stacks project. It is an open source textbook and reference work on algebraic stacks and the algebraic geometry needed to define them. For more general information see our extensive about page.
We are organizing a workshop in algebraic geometry, where the Stacks project will play an important role. The workshop will be at the University of Michigan in Ann Arbor, from July 31 to August 4 2017. For more information and the option to pre-register, check the workshop's webpage.
The Stacks project is a collaborative effort. There is a list of people who have contributed so far. While browsing the Stacks project please provide feedback by leaving a comment. Another option is to suggest slogans for results. For more details please visit the contribute page.
You can search the Stacks project by keywords:
If you on the other hand have a tag for an item (which can be anything, from section, lemma, theorem, etc.) in the Stacks project, you can look up the tag's page.
Items (sections, lemmas, theorems, etc.) in the Stacks project are referenced by their tag. See the tags explained page to learn more about tags and how to reference them in a LaTeX document.
Recent changes to the Stacks project
The Stacks project is hosted at GitHub, so you can browse the complete history there.