I'm designing a template intended for mathematical writing. I'd like to fill the template with Lorem ipsum text, but would like that text to showcase some of the common ways that mathematics is typeset. I could use some randomly generated text using either LaTeX's blindtext package or a random paper generator (although the phony formulas in those can get pretty crunchy), but is there some canonical text that's used for this purpose, or some classical text (language doesn't matter) that would be cool to use for this?