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Re: I have tried and errored a reasonable amount of times

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Date Fri, 5 Sep 2014 13:02:47 +1000
Subject Re: I have tried and errored a reasonable amount of times
From Chris Angelico <rosuav@gmail.com>
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On Fri, Sep 5, 2014 at 12:53 PM, Denis McMahon <denismfmcmahon@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@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

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Thread

I have tried and errored a reasonable amount of times Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-30 14:27 -0400
  Re: I have tried and errored a reasonable amount of times Tim Chase <python.list@tim.thechases.com> - 2014-08-30 13:48 -0500
    Re: I have tried and errored a reasonable amount of times Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-30 14:50 -0400
      Re: I have tried and errored a reasonable amount of times Ned Batchelder <ned@nedbatchelder.com> - 2014-08-30 16:20 -0400
        Re: I have tried and errored a reasonable amount of times Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-30 16:32 -0400
      Re: I have tried and errored a reasonable amount of times Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-31 18:37 +1000
        Re: I have tried and errored a reasonable amount of times Chris Angelico <rosuav@gmail.com> - 2014-08-31 19:16 +1000
    Re: I have tried and errored a reasonable amount of times Grant Edwards <invalid@invalid.invalid> - 2014-09-02 16:43 +0000
      Re: I have tried and errored a reasonable amount of times Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-09-02 12:59 -0400
      Re: I have tried and errored a reasonable amount of times Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-03 11:44 +1000
        Re: I have tried and errored a reasonable amount of times Rustom Mody <rustompmody@gmail.com> - 2014-09-02 20:14 -0700
          Re: I have tried and errored a reasonable amount of times Steven D'Aprano <steve@pearwood.info> - 2014-09-03 07:16 +0000
            Re: I have tried and errored a reasonable amount of times Marko Rauhamaa <marko@pacujo.net> - 2014-09-03 10:44 +0300
              Re: I have tried and errored a reasonable amount of times Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-09-04 11:54 +1000
                Re: I have tried and errored a reasonable amount of times Chris Angelico <rosuav@gmail.com> - 2014-09-04 12:03 +1000
                Re: I have tried and errored a reasonable amount of times Rustom Mody <rustompmody@gmail.com> - 2014-09-03 19:23 -0700
                Re: I have tried and errored a reasonable amount of times Marko Rauhamaa <marko@pacujo.net> - 2014-09-04 08:36 +0300
            Re: I have tried and errored a reasonable amount of times Denis McMahon <denismfmcmahon@gmail.com> - 2014-09-04 11:17 +0000
              Re: I have tried and errored a reasonable amount of times Chris Angelico <rosuav@gmail.com> - 2014-09-04 21:42 +1000
                Re: I have tried and errored a reasonable amount of times Denis McMahon <denismfmcmahon@gmail.com> - 2014-09-05 02:53 +0000
                Re: I have tried and errored a reasonable amount of times Chris Angelico <rosuav@gmail.com> - 2014-09-05 13:02 +1000
                Re: I have tried and errored a reasonable amount of times Grant Edwards <invalid@invalid.invalid> - 2014-09-05 14:54 +0000
                Re: I have tried and errored a reasonable amount of times Marko Rauhamaa <marko@pacujo.net> - 2014-09-05 19:45 +0300
  Re: I have tried and errored a reasonable amount of times Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-30 22:21 +0100
    Re: I have tried and errored a reasonable amount of times Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-30 17:48 -0400
      Re: I have tried and errored a reasonable amount of times Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-30 23:32 +0100
      Re: I have tried and errored a reasonable amount of times Cameron Simpson <cs@zip.com.au> - 2014-08-31 15:30 +1000
      Re: I have tried and errored a reasonable amount of times Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-31 19:05 +1000

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