The Stacks project

Remark 42.42.2. Let $(S, \delta )$ be as in Situation 42.7.1. Let $X$ be locally of finite type over $S$ satisfying the equivalent conditions of Lemma 42.42.1. Let $X = \coprod X_ n$ be the decomposition into open and closed subschemes such that every irreducible component of $X_ n$ has $\delta $-dimension $n$. In this situation we sometimes set

\[ [X] = \sum \nolimits _ n [X_ n]_ n \in \mathop{\mathrm{CH}}\nolimits ^0(X) \]

This class is a kind of “fundamental class” of $X$ in Chow theory.

Comments (0)

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Your email address will not be published.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 0FE4. Beware of the difference between the letter 'O' and the digit '0'.