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

From	Marko Rauhamaa <marko@pacujo.net>
Newsgroups	comp.lang.python
Subject	Re: I have tried and errored a reasonable amount of times
Date	2014-09-03 10:44 +0300
Organization	A noiseless patient Spider
Message-ID	<87a96hcfml.fsf@elektro.pacujo.net> (permalink)
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Steven D'Aprano <steve@pearwood.info>:

> Who uses + for disjunction (∨ OR) and concatenation for conjunction (∧
> AND)? That's crazy notation.

That's the classic Boolean algebraic notation. In basic algebra, the two
interesting operations are "addition" and "multiplication". Boolean math
works like elementary arithmetics, with the exception that

   1 + 1 = 1

I'm guessing the modern symbols ∨ and ∧ were derived from the
set-theoretical analogues, ∪ and ∩, which were also formerly used for
the same purpose.


Marko

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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