Have you ever wondered why so few of my nieces and nephews ever ask me, their mathematician uncle, for help with math homework?
Wonder no more!
(No, I'm not an awful person. I gave Heather appropriate instruction for her bright mind, and to hell with the school's concept of what's grade-appropriate. I then did the full writeup to show her a little bit of how formal mathematics looks and reads.)
(And, of course, the moment you share a result you discover a simple arithmetic error. Corrected URL.)
