Not the "most beautifully typeset", but Augustin Louis Cauchy's "Cours d'Analyse de l'École Royale Polytechnique" in 1821 looks to have been done with TeX. htt

Not the "most beautifully typeset", but Augustin Louis Cauchy's "Cours d'Analyse de l'École Royale Polytechnique" in 1821 looks to have been done with TeX. https://archive.org/details/coursdanalysede00caucgoog/page/n7/mode/2up https://archive.org/details/coursdanalysede00caucgoog/page/n... At the end of the introduction, he thanked a few people for their guidance. That's the who's who of mathematics and physics: Poisson, Ampère, and Coriolis.