The Stacks project

Definition 90.14.4. Let $\mathcal{F}$ be a predeformation category. We say a versal formal object $\xi $ of $\mathcal{F}$ is minimal1 if for any morphism of formal objects $\xi ' \to \xi $ the underlying map on rings is surjective. Sometimes a minimal versal formal object is called miniversal.

[1] This may be nonstandard terminology. Many authors tie this notion in with properties of tangent spaces. We will make the link in Section 90.15.

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Your email address will not be published.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 06T4. Beware of the difference between the letter 'O' and the digit '0'.