Message Forum: Re: New subscriber-only feature?

Re: New subscriber-only feature?

Posted By: commie_bat, on host 207.35.236.194
Date: Friday, September 17, 2004, at 16:53:02
In Reply To: Re: New subscriber-only feature? posted by wintermute on Friday, September 17, 2004, at 16:11:10:

> > Actually, "if A then B" implies "if (not B) then (not A)". It does not imply "if (not A) then (not B)".
> >
>
> From a purely logical point of view, yes. However people rarely mean what they say in a purely logical way.
>
> If someone says to you "I'll give you $5 if you eat a bug", it's a fair assumption, surely, that not eating the bug means that you don't get the money. Even though logically that was never explictly stated.
>

That's not a case of the person not logically meaning what he says. It's a case of the pesron logically meaning more than he says.

The person in your example means to say "I'll give you $5 IF AND ONLY IF you eat a bug".

The "if" is still in there, which logically implies that, if you didn't get the $5, you haven't eaten a bug.

But you're right, people aren't always completely logical.

^v^:)^v^
FB

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Message:	> > > Actually, "if A then B" implies "if (not B) then (not A)". It does not imply "if (not A) then (not B)". > > > > > > > From a purely logical point of view, yes. However people rarely mean what they say in a purely logical way. > > > > If someone says to you "I'll give you $5 if you eat a bug", it's a fair assumption, surely, that not eating the bug means that you don't get the money. Even though logically that was never explictly stated. > > > > That's not a case of the person not logically meaning what he says. It's a case of the pesron logically meaning more than he says. > > The person in your example means to say "I'll give you $5 IF AND ONLY IF you eat a bug". > > The "if" is still in there, which logically implies that, if you didn't get the $5, you haven't eaten a bug. > > But you're right, people aren't always completely logical. > > ^v^:)^v^ > FB
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