2010-03-11, 06:37 PM
ClawofBeta Wrote:They have some faulty premises.
"For any two different real numbers, you can pick a third number which is between them."
Who said that?
It comes from the property that real numbers can be compared. If two numbers are different, that is, a =/= b, then either a < b or b < a, correct? This also means that there exist a number c, which makes a + c = b, or b + c = a. The number c can then be written as c = a - b (or b - a), if you know both a and b. If you divide c by 2, then a < a + c/2 < b, which proves there is a number between.
ShiKage Wrote:1 is an integer. 0.9999999 repeated isn't. Therefore 1 != 0.9999999999999. 0.9999999999999 is a number which is missing a fragment of its ability of becoming a whole number. Whether that be impossible to see the difference in, it's still not the same as the integer "1." It's still not a whole number.
We're not talking about different sets of numbers. True enough, 1 is an integer, but 1 is a real number as well. (1 can be written as 1.0, 1.000, 1.000... etc)

