I have tried and errored a reasonable amount of times

Grant Edwards invalid at invalid.invalid
Fri Sep 5 16:54:36 CEST 2014


On 2014-09-05, Denis McMahon <denismfmcmahon at 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 <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!

AFAIK, that's the standard notation in both CS and EE university
classes in the US also: + for 'or' and dot or abuttal for 'and'.

Well, it was 30 years ago...

-- 
Grant Edwards               grant.b.edwards        Yow! But was he mature
                                  at               enough last night at the
                              gmail.com            lesbian masquerade?



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