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 16:00:47
In Reply To: Re: New subscriber-only feature? posted by Matthew on Friday, September 17, 2004, at 15:49:05:

> > You're reading too much into it. I never said anything about if it's not the new game.
> > For your information, "if A then B" does not mean "if not A then not B".
>
> Perhaps I am, then. The two are not logically the same, but the implication is clear. "If (event A) then (event B, requiring some action on my behalf)" implies that if (not A) then (not B).

Actually, "if A then B" implies "if (not B) then (not A)". It does not imply "if (not A) then (not B)".

There's a big difference.

Take the true statement "If it is made of wood, it can be burned".

In this case, A = "it is made of wood" and B = "it can be burned".

Clearly, this implies "if (not B) then (not A)", because if it doesn't burn, you know it's not made of wood.

It does not imply "if (not A) then (not B)", because it might be made of something other than wood that can still burn, for example hydrogen.

Hope this clears things up.

^v^:)^v^
FB

Replies To This Message

Re: New subscriber-only feature? - Matthew - Fri, 9/17/2004, 20:00:01
Re: New subscriber-only feature? - wintermute - Fri, 9/17/2004, 16:11:10
- Re: New subscriber-only feature? - commie_bat - Fri, 9/17/2004, 16:53:02

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Message:	> > > You're reading too much into it. I never said anything about if it's not the new game. > > > For your information, "if A then B" does not mean "if not A then not B". > > > > Perhaps I am, then. The two are not logically the same, but the implication is clear. "If (event A) then (event B, requiring some action on my behalf)" implies that if (not A) then (not B). > > Actually, "if A then B" implies "if (not B) then (not A)". It does not imply "if (not A) then (not B)". > > There's a big difference. > > Take the true statement "If it is made of wood, it can be burned". > > In this case, A = "it is made of wood" and B = "it can be burned". > > Clearly, this implies "if (not B) then (not A)", because if it doesn't burn, you know it's not made of wood. > > It does not imply "if (not A) then (not B)", because it might be made of something other than wood that can still burn, for example hydrogen. > > Hope this clears things up. > > ^v^:)^v^ > FB
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