Etymological and Historical Dictionary of Math

 Another from my archives: Nice for Alg II level or so, I think. A colleague from Colorado sent me an interesting probability problem the ot...

T-Z Tally/Tally Sticks Tally comes from the name of a stick on which counts were made to keep a count or a score.  THe Latin root is ta...

S Sagitta   The versine or versed sine is a trigonometric function found in some of the earliest (Sanskrit Aryabhatia, Section I) trigono...

Q "Q.E.A  The acronym for quod est absurdum (“which is absurd“) — a Latin phrase used in the old days to conclude a proof by contrad...