Author: Dmitri Pavlov Format: MarkdownItexAdded some information and fixed a broken link.
<a href="https://ncatlab.org/nlab/revision/diff/Joseph+Krasil%27shchik/3">diff</a>, <a href="https://ncatlab.org/nlab/revision/Joseph+Krasil%27shchik/3">v3</a>, <a href="https://ncatlab.org/nlab/show/Joseph+Krasil%27shchik">current</a>