Zkuq said:
x = 0.999... and therefore 'subtract x' is the same thing as 'subtract 0.999...'. You can operate on both sides of an equation; the form you operate on each side is up to you to decide as long as both forms are equal. Besides, your point about treating x as a constant instead of a variable doesn't make much sense. x is x and it has a known value; what's the problem? Oh I get it. You're just trying to mess with us. |
i'm not messing with you. the problem with his proof is he is treating x as a variable. but it is a constant as he has stated in the first step. you can't just suddenly decide x is a variable in the middle of a proof when he has stated it's a constant at the start of a proof. In a proof you must define x to a degree for example x is any positive integer. he defined x as 0.99999. nothing else. his proof is completely wrong.
http://en.wikipedia.org/wiki/User:ConMan/Proof_that_0.999..._does_not_equal_1
