[sammyg2]

I've worked with my daughter on her math for years, one thing has become incresingly obvious.
It depends on who wrote the math book.

The vocabulary and the terminology is up to the author's discression in too many cases.
Guess it makes them feel smarter to take common math and regurgitate it with a twist so that it looks like they have come up with something new.
Now days doing math is less about understanding math concepts and more about being able to look things up in a book. It isn't supposed to be a puzzle.