RE: Actual Infinity in Reality?
February 21, 2018 at 3:55 am
(This post was last modified: February 21, 2018 at 3:57 am by Anomalocaris.)
(February 21, 2018 at 3:20 am)pocaracas Wrote:(February 20, 2018 at 10:37 pm)SteveII Wrote: Ina black hole, you are talking about a property of being infinitely dense. That is not the same thing as having an infinite number of anything in real life.
Being able to count infinitely is a potential infinite. You can never actually arrive at infinity. The question the thread is concerned about is whether an actual infinite can exist (something real that has an infinite number of things).
Density is defined as "number of things per unit volume", so infinite density is equivalent to infinite number of things.
That is, if a black hole indeed has infinite density...
No. A finite number of things per zero volume is also infinite density.
(February 20, 2018 at 11:37 pm)surreptitious57 Wrote: The lifespan of a photon in vacuum is regarded as being infinite though it would have to be predicated on two other factors
Namely that its journey is only ever through empty space and that the Universe itself is either temporally or spatially infinite
Actually, by relativity, time does not pass for a photon traveling through empty space. Hence it is meaningless to say what it’s lifespan is.
