I find the new text color easier to read. I hope everyone else shares my opinion since you put some work into catering to it.

Math notation is not great generally. There are canonical notations for somethings, and some times they're overloaded. Not much to do about it other than know about it.

Annoyingly you have to "know your audience" to get your math notation right for who you're presenting to. (You can never really do that on the Internet)

As an electrical engineer who's done a lot of DSP and worked with mathematicians I can point out some things that look either odd or normal depending on who I'm talking to. You can never really win with notation -- you'll always be wrong to someone =), but there are choices that are maybe less wrong for one discipline or another.

All that to say keep writing! You're doing pretty well!