[math-fun] Jeff D. Caldwell quadratic form confusion by me

I apologize to Jeff D. Caldwell, I apparently transposed 2 of his coefficients 1, 0,-1 instead of 1-,1,0. Anyhow, then ok. -- Warren D. Smith http://RangeVoting.org <-- add your endorsement (by clicking "endorse" as 1st step)