On Fri, Sep 5, 2014 at 12:53 PM, Denis McMahon <denismfmcma...@gmail.com> wrote: > On Thu, 04 Sep 2014 21:42:56 +1000, Chris Angelico wrote: > >> On Thu, Sep 4, 2014 at 9:17 PM, Denis McMahon <denismfmcma...@gmail.com> >> wrote: >>> 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. >> >> The middle dot is another notation for multiplication, as is abuttal >> (not actually concatenation, in this context). So they're all saying the >> same thing: boolean 'and' is multiplication, boolean 'or' is addition. > > Yes Chris, I know that. I was responding to Stephen's statement that > using + for or was crazy notation, and pointing out that 30 years ago, > that's what UK colleges were teaching!
Ah, okay. Wasn't sure if you meant to be agreeing with multiplication or offering an alternative. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
