September 19th, 2018, 08:53 PM  #21  
Senior Member Joined: Jun 2018 From: UK Posts: 103 Thanks: 1  Quote:
Is spacetime infinite  no obviously  but Cantor and co have the applied mathematicians thinking there is a valid mathamatical concept of Actual Infinity that legitimises infinite space time. People are wasting serious amounts of time thinking about something that does not exist.  
September 19th, 2018, 08:57 PM  #22  
Math Team Joined: Dec 2013 From: Colombia Posts: 7,511 Thanks: 2514 Math Focus: Mainly analysis and algebra  Quote:
I rather suspect that you don't know what you are talking about here.  
September 19th, 2018, 09:00 PM  #23  
Senior Member Joined: Feb 2016 From: Australia Posts: 1,737 Thanks: 606 Math Focus: Yet to find out.  Quote:
2. I think the 'Applied Mathematicians' can think for themselves. 3. It seems the only time that's getting wasted is any time spent on this thread.  
September 19th, 2018, 09:01 PM  #24 
Senior Member Joined: Jun 2018 From: UK Posts: 103 Thanks: 1 
Rather than just being rude, give me one example from nature of actual completed infinity or show me how the construct an actually infinite set.

September 19th, 2018, 09:08 PM  #25  
Math Team Joined: Dec 2013 From: Colombia Posts: 7,511 Thanks: 2514 Math Focus: Mainly analysis and algebra  Quote:
The idea that you don't understand how infinities are being used is borne out by your suggestion that having examples of (I assume) physical infinities is in any way relevant to how they are used.  
September 19th, 2018, 09:11 PM  #26  
Senior Member Joined: Jun 2018 From: UK Posts: 103 Thanks: 1  Quote:
‘Because we cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the Universe in its totality is finite or infinite’. This is typical of the confusion maths treatment of infinity is causing in the physical sciences.  
September 19th, 2018, 09:17 PM  #27 
Senior Member Joined: Jun 2018 From: UK Posts: 103 Thanks: 1 
Another example is the debate over whether space and time are continuous or discrete:  Assume time is continuous  take any system over any finite time period  then the system evolves through an actual Infinity of states in a finite time  Reductio ad absurdum, time is discrete. Do you not see how simple things are once we remove the logic error of Actually Infinite? 
September 19th, 2018, 09:18 PM  #28 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,511 Thanks: 2514 Math Focus: Mainly analysis and algebra 
It there some part of that that is unreasonable? I mean, if you have some evidence about the unobservable universe, I reckon there'd be a whole heap of people that'd like to see it. They'll be less interested if it's just you plugging finitist dogma though. 
September 19th, 2018, 09:21 PM  #29  
Math Team Joined: Dec 2013 From: Colombia Posts: 7,511 Thanks: 2514 Math Focus: Mainly analysis and algebra  Quote:
The problem with your argument is that it is circular. That and it begins with your desired conclusion. You want the infinite not to exist, and your reason that it can't exist is that you don't want an infinitude of states to make sense. The truth is that nobody knows whether or not time and space are discrete or continuous, so investigation of both possibilities is reasonable. Also, both have applications for which they give good models, so there's no reason to disbar either.  
September 19th, 2018, 09:23 PM  #30 
Senior Member Joined: Jun 2018 From: UK Posts: 103 Thanks: 1  It’s not dogma. It’s impossible for the Actually Infinite to exist. Space time can’t be actually infinite  it would have no start  if it has no start it does not exist exist in the materialistic world view.


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