Andy, I spent my entire career as a mechanical engineer and I’ve never seen math explained as it was in the Quarterly. I just assumed that my slide rule and I don’t subscribe to “new math” principles. 140 is my number as well.

I tip my hat to the math teacher. In my discipline equations are - let’s call it “over defined” to leave nothing that could be misinterpreted. I do take exception however, to any expression that has 3 equal signs in it.