Everything that is logically possible, but not the logically impossible as would be the case of allowing someone to live forever yet die at the same time.
According to Wikipedia:
-Bri
That is a well balanced article, thanks.
Note that it says "mainstream", this is one of those arguments that as far as I know has never been subject to a "final" decision as far as the Roman Catholic Church is concerned.
Interestingly one way of interpreting Catholic Doctrine is that the question posed "allowing someone to live forever yet die at the same time" could be answered by Mary's Ascension to heaven? (I've never thought of this before so feel free to rain on my parade!)