Although \symbf works only on the letters and not the operators, unicode-math supports \boldmath if you load a math font that has a bold weight (currently XITS Math, Libertinus Math and Minion Math). You can also \setmathfont[version=bold]{XITS Math Bold}. The \boldsymbol\increment (f...
Backstory - I have not been in school for 5ish years, and am returning to take some grad classes in the field of Solid Mechanics. I am freaking out a bit about the math (am rusty). I have not started class yet, but figured I would get my books and start working through problems....
Many benefits are available to Delta credit card holders, and it's where these credit cards shine. However, before you ask, "Is it worth getting a Delta credit card?" you must ask, "Will I use these benefits?" Well, let's do some math. ...