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Date: Thu, 4 Sep 2014 21:42:56 +1000
Subject: Re: I have tried and errored a reasonable amount of times
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:77543

On Thu, Sep 4, 2014 at 9:17 PM, Denis McMahon <denismfmcmahon@gmail.com> wr=
ote:
> On Wed, 03 Sep 2014 07:16:34 +0000, Steven D'Aprano wrote:
>
>> Who uses + for disjunction (=E2=88=A8 OR) and concatenation for conjunct=
ion (=E2=88=A7
>> AND)? That's crazy notation.
>
> The way I was taught it in the mid 1980s, a.b =3D=3D=3D a and b, a+b =3D=
=3D=3D 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.

ChrisA