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Infinity is a purely mathematical term and only applicable to mathematical and not physical matters.

Quote from: SS Infinity is a purely mathematical term and only applicable to mathematical and not physical matters.Wow!!! Someone with (possibly infinitely) more knowledge of the subject than I, has actually said what I have frequently been castigated for saying, in another forum. I'm going to celebrate. Thanks, Soul Surfer. []

infinities pop up in theory all the time. A good example is an infinite spacetime void. This is actually acceptable, and in every sense of the theory, is a physical infinity as well.

I much prefer the concept of unbounded or indefinite for the physical concept.

A truly mathematically infinite universe requires there to be an infinite number of identical earths in which every person is doing the exact same thing as we are doing at this moment and an greater infinity of worlds like the earth where people are doing slightly different things and that is before we come to a range of other options like rearranging the stars.This to my mind is completely stupid and that is why I much prefer the concept of unbounded or indefinite for the physical concept.

Mind-boggling, yes, but not stupid; it is an inevitable consequence of an infinite universe. I find it far more plausible and easy to understand than a finite universe, with the weird geometry that it implies.

Quot homines tot sententiae; but as long as you discuss mathematical infinities as though they were synonymous with physical infinity you are likely to keep going round in circles.

The one thing I think everyone can agree on about whether infinity can be physically realized is that no one has proof one way or the other, just opinions.

your first assumption is quite a revelation!!!

nothing finite can become infinite

And what about something eternal, does it have to be infinite?

Infinite in space and eternal (infinite) in time

Infinity is not infinite space, nor is eternity infinite time. We have to think of them in that way because we are unable to even imagine the possible dimensions of infinity. While there is nothing wrong with ArkAngle's answer in terms of our 4D thinking, it is important to remember that it is a sort of "model", perhaps the nearest we can come to understanding the real thing.

just because we can grok the concept of infinity doesn't necessarily mean anything actually is infinite

Similarly, just because we can grok the concept of infinity doesn't necessarily mean anything actually is infinite.

A Series can be! (tongue firmly in cheek!)

"A gravitational singularity or spacetime singularity is a location where the quantities that are used to measure the gravitational field become infinite in a way that does not depend on the coordinate system. These quantities are the scalar invariant curvatures of spacetime, some of which are a measure of the density of matter."

Is it possible that the universe has appeared from nothing?

But it doesn't mean it is necessarily infinite in the other dimensions.

In fact a black whole is a tunnel between universes.

Perhaps you should start by asking yourself if there can ever have been a time when there was nothing. It's surprising where you can go from there. [8D]

I've been trying to get my head round this for some time. Does "eternal" automatically imply "infinite"? I feel it should, but have yet to formulate the necessary argument to my own satisfaction.

Something eternal is something that doesn't have extension in the temporal direction. Its value is the same at all points on the time axis.

Quote from: tbarronSomething eternal is something that doesn't have extension in the temporal direction. Its value is the same at all points on the time axis.This captures a major factor in the problem. If it "doesn't have extension in the temporal direction", how can it be present "at all points on the time axis"?

Its value might be zero at all points on the time axis.

We noticed gravity and understood it well - at a point in our history when gravitational attraction was observable as a fixed (in place and in time) non-zero quantity

Is black hole mass infinitely dense?Is this proved or dogma?peacerwjeffersonforce is inertial differential

It isn't proven as such. Penrose and Hawking singularities dictate that a black hole has a singular region which is infinitely dense.

We are all playing with words because we just do not know.

I don't think anyone can definitively answer this question since our theories don't cover it...

Fellow GeezersForce as......