luke warm, on Mar 27 2006, 08:23 PM, said:
also, there is no logical basis for an *actual* infinite universe... this can be seen by taking a small slice of this universe, the time line, and showing that you can in fact add and subtract from it... we know when sept 11, 2001, was, we can point to it on the time line... if the universe, hence time, was infinite, there would be no way that you or i could say we live this day, this month, this year, because this particular point in time would not exist, we would never arrive "here" by adding 1 year to the next (if infinite, there are an infinite number of time intervals between one another, etc)
I'm completely unable to see your point here.
First of all, one should be very careful with assumptions about the nature of "time". Especially one should not equal time to the physical notion of time.
In physics, time is used to measure the rate at which changes occur. To be able to handle it mathematically, time is quantified (by observing nature and creating a reference point that way).
Now, the physicist's notion of time as a "line" where you can mark events (which undoubtely makes a lot of sense) or as a fourth dimension (which ostensibly makes a lot of sense as well, although I don't have an intuitive grasp of that concept) has become so deeply ingrained in us that we believe that this actually
is time.
Just to offer one alternative: maybe everything
has already happened and what we perceive as "time" or "change" is
not real in an absolute way. Maybe it is just an illusion which we are prone to. Maybe the people who claim to be clairvoyants have found a way to see more in the pattern of things-that-have-already-happened than the ordinary person. This is very speculative and only used here to illustrate my point that taking the concept of "time line" for granted and deriving statements about the impossibility of an infininite existence from it is shortsighted, in my eyes (no offense, Luke).
Apart from that I also don't get why, even if the timeline is real in an absolute sense, it could not be infinite in both directions. The set of real numbers is infinite (not even enumerable) and still you can easily compare two given real numbers in size. Likewise you can compare two given points in time to eachother, no matter where they are on the timeline.
"This particular point in time" always exists, actually it is the only thing that we can absolutely sure of. Past and future are illusions created by our mind (this is easy enough to see if you think about it).
--Sigi