From: Ross A. Finlayson (extropy@apexinternetsoftware.com)
Date: Tue Nov 19 2002 - 22:48:06 MST
On Tuesday, November 19, 2002, at 08:10 PM, gts wrote:
> Lee Corbin wrote:
>
>>> For example one cannot see the stars unless one first has eyes
>>> to see, but having eyes to see does not cause one to see the
>>> stars. Eyesight is a necessary condition but not a cause.
>>
>> We are talking about events, events of some type or other.
>> The claim was about events of type A always preceding
>> events of type B in time. Not conditions.
>
> I can rephrase it in terms of events only:
>
> One cannot see the stars unless one first opens one's eyes, but opening
> one's eyes does not cause one to see the stars.
>
> -gts
>
What about plugging electrodes into your visual cortex with astronomical
inputs, or getting hit in the head?
I think what I mean to say is that A -> B does not necessarily also
imply B -> A, or ~A -> ~B. As an example, when it rains then water
falls on the ground, when water is on the ground it does not necessarily
imply rain.
Ross
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