Yes, there is. You need to download the style file, and save locally on your computer. Then, if you want to reformat any existing (or new) notebook without copying the content, you choose Format -> Stylesheet -> Other . In the file selection dialogue box which opens, you look up the file "latex-style.nb" (you can of course re-name it after your taste) and click on it. This will implement the style definitions into your notebook. You can use numbered and unnumbered equations in the style menu, and you can start and finish in-line formulas with Ctrl-9 and Ctrl-0 (at least on a Mac). The formulas should appear in Euclid italics, as in the sample file I had in my discussion entry.