[quote][b]Posted by:[/b] Dream053 What I'm unclear on is whether in the context of, say, the mass of some physical matter, if, mathematically .999... would still truly equal 1. It seems that this is true because it is demanded by Humanity's mathematicians (which still seems to be out of convenience), rather than a declarative proof by mathematics itself. That is more along the lines of what I was asking initially.[/quote] It's hard, if not impossible, to apply infinity to anything real world. However, if something weighed one pound it would also weigh .999.... pound.