Opening the book…
This page titled 3: Formulation was last modified on Wed, 15 Sep 2021 00:46:13 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Kate Gilbert and Ken Prusa (Iowa State University Digital Press) via source content that was edited to the style and standards of the LibreTexts platform.
The book could not be loaded just now.