you can defend that only if you consider, as beginning and end, two atemporal locations in spacetime. Ergo, you need to label as “beginning” a certain location in spacetime. Not in time. Same with “end”. So, the beginning has not a temporal coordinate, but a spacetime one, since only events on the 4 dimensional manifold have objective meaning.
Instead of two isolated atemporal locations (which I don't think actually makes that much sense except perhaps from a chosen frame of reference?), I can use any defined boundary for beings in space-time, just as I would consider the entire surface of the Earth to be the beginning and ending of the Earth and not just one point on the surface of the Earth as being the "beginning" of the Earth, except by choosing that point in a frame of reference.
what are the coordinates in spacetime of spacetime itself? Hoe can you say, according to this ontology, then, that the Universe had a beginning?
I agree this is a problem. The universe itself is not a space-time event, it is the collection of ALL space-time events. The cup that holds the water is not itself part of the water.
Only in the sense that the surface of the Earth has a beginning at the north pole.
More like in the sense that the Earth has a surface.
It's unsound because both its premises have been shown to be scientifically questionable. It is not clearly true that everything with a beginning has a cause, nor is it necessarily true that the universe had a beginning. Nor can we necessarily deduce anything about causation of the universe as a whole based on observations of what goes on within it (specifically within space-time).
To be unsound it has to be false. Science has not shown it to be false. Science is more supportive of the premises as sound than unsound.
It starts of with Hilbert's Hotel, which (as has already been discussed earlier in this thread) isn't absurd at all, just counter-intuitive. There are no logical problems with real infinities otherwise we couldn't deal with them mathematically. The domino's just confuse a start an infinite time ago with an infinite past with no start. As we now understand time as just a direction in space-time, an infinite past is no more difficult to imagine than infinite space (which we have reasonable reasons to think is actually the case).
Got bored after that. I've read WLC's arguments before and they're all just laughable.
The Hilbert's Hotel Analogy failed to raise a relevant objection.
His argument against the Hilbert Hotel amounts to saying 'this doesn't make sense, so it must be wrong!'. He actually gives no contradiction.
In the second, the first axiom should be closer to 'a collection formed by successive addition *from a beginning* cannot be an actual infinite'. This would be true, but does not apply, because the second axiom would then have to be 'the temporal series of events formed by successive addition from a beginning'. And that is precisely the point that is at issue: was there a beginning or not? So, he has assumed his conclusion. Not a valid argument.
The singularity theorems depend on a non-quantum description and do not apply to any of the quantum gravity theories we have, so the conclusion does not follow.
I didn't see the fourth, but you only asked to show one was wrong and I showed three.
I would agree that he hasn't been very explanatory about his objections.
Do you see the jump in logic here? You went from 'This will go on forever and ends up in an infinite regression' to ' Thus the conclusion is that the universe had a beginning'.
The problem is that the conclusion 'The universe had a beginning' doesn't follow from the infinite regression in the previous sentence.
I never said there indeed is an infinite regression.
You did refer to an infinite regression in the OP though.
In philosophy, infinite regression is a "no no". There are lots of arguments for it. If you wish, that can be discussed.
The problem with infinite regression seems to be an important point.
In all honestly, unless we know the first cause, its pretty pointless to argue or debate about a/the first cause unless its all addressed as opinion.
If B caused C and A caused B,, isnt it logical to think A had a cause or is it an opinion?
If B caused C and A caused B, then, no, it does not logically follow that A had a cause.
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It seems to me that people are arguing either that the universe is eternal (and caused itself) or they are arguing that it had a cause besides itself (which is eternal).
Is it correct to say that everyone agrees there is an eternal cause? Is there anybody arguing that the universe is both not itself eternal, self-causing AND did not have a cause which is eternal?