# Thread: What is the definition of an event?

1. ## What is the definition of an event?

What is the definition of an event?

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Originally Posted by tommac
What is the definition of an event?
A pair : (t, P(x,y,z))

3. Originally Posted by macaw
A pair : (t, P(x,y,z))
A pair of what?

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Originally Posted by tommac
A pair of what?
Do you understand the notation? "t" for time, "P(x,y,z)" for a point in space.

5. Originally Posted by macaw
Do you understand the notation? "t" for time, "P(x,y,z)" for a point in space.
OK so everything is any event.

6. In the advent of there being a event... there needs to be a time and place for it...

If there's a time and a place. Then a event can said to have occurred.

7. Originally Posted by astromark
In the advent of there being a event... there needs to be a time and place for it...

If there's a time and a place. Then a event can said to have occurred.
Like just plotting 4d space doesnt make an event right?

8. Originally Posted by tommac
Like just plotting 4d space doesnt make an event right?
I would say that plotting 4d space is an event. It happens in time and in place, right?

9. Originally Posted by Jens
I would say that plotting 4d space is an event. It happens in time and in place, right?
Fair enough. I guess I was using a different ( non-mainstream ) definition of an event. For some reason I thought that something needed to be measured or observed for it to be an event.

10. If any moment can be said to have happened then it can be said that it happened some place in space and time... and that it was a event.

Anything is a event. All it needed was a time and place.

So looking at its reverse logic... If it had no time or place... It did not happen, and was not a event.

11. Originally Posted by tommac
Fair enough. I guess I was using a different ( non-mainstream ) definition of an event. For some reason I thought that something needed to be measured or observed for it to be an event.
A tree falling in a forest makes a sound even if no one is there to hear it.

12. Originally Posted by WayneFrancis
A tree falling in a forest makes a sound even if no one is there to hear it.
Are you sure of that? Well, it's only a semi-serious question, but there are two difficulties about it. I think one is the real ontological problem. How can we possibly know if a falling tree makes a sound when not being observed, since we would need to observe it to determine it to be true (assuming that by "being there to hear it" would include putting a recording device nearby).

There's also the issue of concepts. The AmericanHeritage dictionary online has a number of definitions of "sound," but the two that are of interest are:

1.a Vibrations transmitted through an elastic solid or a liquid or gas, with frequencies in the approximate range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.
1.c The sensation stimulated in the organs of hearing by such vibrations in the air or other medium.
It seems that it would (presumably) make a sound under definition 1a, but would certainly not under definition 1c.

13. I see the point being made here... My PC is not reflecting the sound... So was there one... ?

YES. How do I know this ? Because I have seen a falling tree.

I know it can not happen without some sound.

and that the absence of a listening ear.. does not make it silent.

A lifetime of learning. A experienced bushman.

There are parallels in astronomy. ( is this the point maybe ?)

A star is seen to have had a nova.. but nobody hears it...

We know it was a noisy event... But no transmission medium is present.

Returning to the OP... The event can be said to have happened.
Last edited by astromark; 2010-Oct-19 at 05:35 AM. Reason: added line.

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