The discussion centers on issues with quoting excerpts from posts that contain LaTeX formatted with double dollar signs in the Physics Forums message editor. Users have experienced problems where MathJax marks are lost when quoting excerpts, leading to formatting issues. It was noted that while double dollar signs remain in the system for original posts, quoting excerpts can disrupt the LaTeX rendering. A suggested workaround is to quote the entire post and then delete unnecessary parts, as this preserves the formatting. Additionally, users mentioned a keyboard shortcut for inserting comments within quotes to streamline the process.