stacks.math.columbia.edu

The Stacks project: Open source for algebraic geometry

If you're looking for a reliable resource for advanced math, look no further than stacks. math. columbia. edu can be your best friend. This is not just a blog or a news portal, but a real open textbook and reference book. The topic here is narrow, but very important - algebraic geometry. The project positions itself as open source, which means the materials are available to everyone without any barriers.

It is interesting to watch how this project develops. On the main page you can see statistics that impress even specialists. As of the end of March 2026, The Stacks project already has 7641 pages. This is a huge amount of information! Additionally, the code contains 765808 lines. The numbers speak for themselves about the scale of the work that the authors have done.

• Volume of content:More than seven thousand pages of text.
• Structure:The material is divided into 3292 sections and 116 chapters.
• Organization:A system of 21,394 tags is used to easily find the desired topic.

As for community activity, it is quite high. In the comments section you can see recent posts from different users. For example, Thierry Coquand left an entry on March 31, 2026, and Elia Immanuel Auer left an entry on March 30 of the same year. There are also comments from anonymous users and members of the Stacks project. This shows that the resource is alive and people are actively using it, asking questions or suggesting corrections.

Some of the dates in the list of recent updates look a little strange, for example, a lot of entries from January 30, 2026 in a row. Perhaps this is a technical artifact or simply a period of active change. But the main thing is that the site works correctly and provides access to a huge amount of knowledge. This is a real treasure for students and researchers of algebraic geometry.

Why is it worth paying attention?

Firstly, the open source code allows anyone to check the correctness of the presentation. Secondly, such a detailed structure with tags helps you quickly find the desired section. Thirdly, regular updates show that the project is not abandoned, but continues to develop. Although there are no exact contact details, such as email or phone number, on the main page, activity in the comments replaces direct contact with the authors.

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• The Stacks project
• bibliography
• table of contents
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• search
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• https://www.math.columbia.edu/~dejong/wordpress/
• https://github.com/stacks/stacks-project
• Recent commits
• Tags: Added new tags
• Try to fix XyJaX problem
• t -> y two times
• Explain why regular element
• Fix typo in proof
• Recent blog posts
• Update
• Nonflat deformation theory
• de Rham cohomology of an Artinian ring
• Surjective map from affine space
• The theorem on formal functions

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