--- date: 2022-02-23 18:45 modification date: Thursday 24th March 2022 14:59:49 title: smooth algebra aliases: [smooth algebra] --- Last modified date: <%+ tp.file.last_modified_date() %> --- - Tags - #CA - Refs: - #todo/add-references - Links: - #todo/create-links --- # smooth algebra A definition due to Kontsevich: a [DGA](Unsorted/DGA.md) $A$ is **smooth** if $A \in \Perf\left(A \otimes A^{\op} \right)$. It is compact if $\operatorname{dim} H^{\bullet}(A, d)<\infty$. This properties are preserved under the derived [[Morita equivalence]]. % https://q.uiver.app/?q=WzAsNSxbMCwyLCJcXHN1YnN0YWNre0kgXFxcXCBcXFxcIChJXjIgPSAwKX0iXSxbMiwyLCJNIl0sWzQsMiwiQSJdLFs2LDIsIjAiXSxbNCwwLCJQIl0sWzAsMV0sWzEsMiwiXFx2YXJlcHNpbG9uIl0sWzIsM10sWzQsMiwiXFxudSJdLFs0LDEsIlxcZXhpc3RzIHUiLDAseyJzdHlsZSI6eyJib2R5Ijp7Im5hbWUiOiJkYXNoZWQifX19XV0= \begin{tikzcd} &&&& P \\ \\ {\substack{I \\ \\ (I^2 = 0)}} && M && A && 0 \arrow[from=3-1, to=3-3] \arrow["\varepsilon", from=3-3, to=3-5] \arrow[from=3-5, to=3-7] \arrow["\nu", from=1-5, to=3-5] \arrow["{\exists u}", dashed, from=1-5, to=3-3] \end{tikzcd} ![Pasted image 20210625203016](attachments/Pasted%20image%2020210625203016.png) ![](attachments/Pasted%20image%2020220324150009.png)