The Stacks project

Remark 78.20.4. In future chapters we will use the ambiguous notation where instead of writing $\mathcal{S}_ X$ for the stack in sets associated to $X$ we simply write $X$. Using this notation the diagram of Lemma 78.20.3 becomes the familiar diagram

\[ \xymatrix{ R \ar[r]_ s \ar[d]_ t & U \ar[d]^\pi \\ U \ar[r]^-\pi & [U/R] } \]

In the following sections we will show that this diagram has many good properties. In particular we will show that it is a $2$-fibre product (Section 78.22) and that it is close to being a $2$-coequalizer of $s$ and $t$ (Section 78.23).


Comments (0)

There are also:

  • 2 comment(s) on Section 78.20: Quotient stacks

Post a comment

Your email address will not be published. Required fields are marked.

In your comment you can use Markdown and LaTeX style mathematics (enclose it like $\pi$). A preview option is available if you wish to see how it works out (just click on the eye in the toolbar).

Unfortunately JavaScript is disabled in your browser, so the comment preview function will not work.

All contributions are licensed under the GNU Free Documentation License.




In order to prevent bots from posting comments, we would like you to prove that you are human. You can do this by filling in the name of the current tag in the following input field. As a reminder, this is tag 04M7. Beware of the difference between the letter 'O' and the digit '0'.