# Re: Is this not logical?

Ian Goddard (igoddard@erols.com)
Tue, 24 Feb 1998 11:07:04 -0500

Dan Fabulich (daniel.fabulich@yale.edu)

>At 11:23 AM 2/23/98 -0500, you wrote:
>>If A implies B to a degree equal to
>>that in which B implies A, then A = B.
>
>No... It means that if either A or B are true, then both are true. This
>is distinctly different from A is B.

IAN: Agreed.

>My weight presses on the floor. The floor exerts a normal force on me.
>Both are true, but they are NOT the same fact.

examples of cases where A <=> B but
not A = B. But I'm not sure that I
agree with the example you cite. If
X exerts force upon Y, then Y will
exert an equal but opposite force
upon X. I believe that this state
of symmetrical force is the same
fact. In short, Newton's third
law describes one fact. No?

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