I have tried and errored a reasonable amount of times

Denis McMahon denismfmcmahon at gmail.com
Fri Sep 5 04:53:13 CEST 2014

On Thu, 04 Sep 2014 21:42:56 +1000, Chris Angelico wrote:

> On Thu, Sep 4, 2014 at 9:17 PM, Denis McMahon <denismfmcmahon at 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!

Denis McMahon, denismfmcmahon at gmail.com

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