28 Sep
2004
28 Sep
'04
12:04 p.m.
From: "Vintage Computer Festival"
<vcf(a)siconic.com>
On Mon, 27 Sep 2004, Dwight K. Elvey wrote:
Hi
I'm sorry, people doing logic have been using + and . a
lot longer than C has been using & and |. I specifically stated
what I would use. Look at most any pre-C math book and
you'll most likely see the + and . used for OR and AND.
These are just symbols until one applies meaning to them. I
don't see the issue. One should be able to adapt to different
conventions because that is the way things will be represented
In my logic, 'A' would indicated the
normally opened contact
an 'a' would be the normally closed contact for relay A.
I'll use + to indicate OR and . to indicate AND.
You already lost me. You may as well have used ! and $ instead of A and
a.
:)
P.S. C programming convention (which most people would relate to
immediately) says that next time you should use & for AND and | for OR.
-- from different sources. I adapt and I hope others learn
to
do it as well.
I don't see the issue with using upper and lower case to
indicate normally close or normally open? What difference
does it make how one represents it?
Dwight
28 Sep
28 Sep
5:29 a.m.
On Tue, 28 Sep 2004, Dwight K. Elvey wrote:
I'm sorry, people doing logic have been using + and . a
lot longer than C has been using & and |. I specifically stated
what I would use. Look at most any pre-C math book and
you'll most likely see the + and . used for OR and AND.
What Genius decided that + should be OR, as opposed to AND, which seems
actually logical and not counter-intuitive?
In my logic, 'A' would indicated the normally
opened contact an 'a'
would be the normally closed contact for relay A. I'll use + to
indicate OR and . to indicate AND.
You already lost me. You may as well have used ! and $ instead of A and
a.
:)
P.S. C programming convention (which most people would relate to
immediately) says that next time you should use & for AND and | for OR. These are just symbols until one applies meaning to
them. I
Right, but it's hard to work around ingrained meanings that have been with
you since 1st grade.
I don't see the issue with using upper and lower
case to
indicate normally close or normally open? What difference
does it make how one represents it?
None, I just felt like pointing out that whoever decided to use the plus
sign for OR was most likely insane.
--
Sellam Ismail Vintage Computer Festival
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2:01 p.m.
>>>> "Vintage" == Vintage
Computer Festival <vcf(a)siconic.com> writes:
Vintage> On Tue, 28 Sep 2004, Dwight K. Elvey wrote:
> >> In my logic, 'A' would indicated
the normally opened contact an
> 'a' >> would be the normally closed contact for relay A. I'll use
> + to >> indicate OR and . to indicate AND.
> >
> >You already lost me. You may as well have used ! and $ instead of
> A and >a.
> >
> >:)
> >
> >P.S. C programming convention (which most people would relate to
> >immediately) says that next time you should use & for AND and |
> for OR.
>
> I'm sorry, people doing logic have been using + and . a lot longer
> than C has been using & and |. I specifically stated what I would
> use. Look at most any pre-C math book and you'll most likely see
> the + and . used for OR and AND.
Vintage> What Genius decided that + should be OR, as opposed to AND,
Vintage> which seems actually logical and not counter-intuitive?
> These are just symbols until one applies meaning
to them. I
Vintage> Right, but it's hard to work around ingrained meanings that
Vintage> have been with you since 1st grade.
AND is closer to multiply -- consider that zero times anything is
zero, and zero (false) AND anything is zero. I believe the notation
comes from mathematics -- group theory (number theory).
paul
2:40 p.m.
>> Sellam Ismail
>> What Genius decided that + should be OR, as opposed to AND,
>> which seems actually logical and not counter-intuitive?
>>
Actually any "genuis" who has worked with set theory, since the "OR"
of two
set is the union of those sets, which evauates to "everything in set A PLUS
everything in set B".
7 p.m.
What Genius decided that + should be OR, as opposed to
AND, which seems
actually logical and not counter-intuitive?
A set-theorist, I guess. It's acutally a very sensible notation, AND is
much closer to multiplication than addition...
A sort-of way to justify this. If take 0 as false and anything greater
than 0 as true (and some BASICs did just that), then multiplying two
'logical' variables is the way you AND them (if either is false (that is 0),
then the product is 0 and thuse false, if both are true (>0), then the
product is also true), and adding them is the way you OR them (if both
are false (0), then the result is false, if either or both are true, the
result is true).
These are just symbols until one applies meaning
to them. I
Right, but it's hard to work around ingrained meanings that have been with
you since 1st grade.
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