On Wed, 03 Sep 2014 07:16:34 +0000, Steven D'Aprano wrote: > Who uses + for disjunction (∨ OR) and concatenation for conjunction (∧ > AND)? That's crazy notation. The way I was taught it in the mid 1980s, a.b === a and b, a+b === a or b. -- Denis McMahon, denismfmcmahon at gmail.com