Asana-Math

Asana-Math is an OpenType mathematical font with advanced layout features based on the OpenType Math extensions. It was developed by Apostolos Syropoulos, based on the Type 1 pxfonts by Young Ryu. Asana-Math is freely available under the Open Font License. The word Asana (Ἀσάνα, Asána) in the Doric dialect is the name of the Greek mythological goddess Athena. It is designed to look similar to, and to blend with, Palatino. The font can be used to typeset mathematics in Unicode using the free typesetting systems XeTeX and LuaTeX, derivatives of TeX, and with Microsoft Office 2007. It was the first free font that could be used instead of Microsoft's Cambria Math with these applications.

From the Wikipedia article “Asana-Math”, licensed under CC BY-SA 4.0.

Serif typefaces like this are the traditional choice for book body text: the serifs guide the eye along the line in long passages. Set novels at 10.5–12 pt with 125–140% leading.

Commercial typefaces require a licence that covers embedding in PDFs and ebooks; check the foundry's licence before you publish.