Don't worry about a 'beginning' point causing problems with infinity. Two points are required in a linear system to creat a finite. A beginning and an end. Secondly as we look back to a 'beginning' we can speculate close to the beginning in time. Now devide that time in half an infinite number of times - and you still don't get to a 'beginning'.
Then it gets really strange - all the time that you cut in half - take the remainder and add them together - result - an infinite amount of time!
Head bent yet?
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