dsgrue3 on 01 May 2013
| Jaydi said: x=2 implies that x²=4. x²=4 implies that (x=2 or x=-2). Now we "sum up" the two implications: x=2 implies that (x=2 or x=-2) which is totally true. Logic is respected and so do the mathematics. |
x = 2 cannot ever be -2, it will always be 2 and no other value. It has already been declared as such.
You're abusing the word "or" here which actually not mean what you're saying. It is really an "either" rather than an "or."
"or" as you imply is intended to be an exlusive or. It isn't in this case as both solutions are proper.
EDIT: I don't want to discuss this any further. It isn't helping with the concept of the OP that 0.999... = 1, which I fully agree with. I just disagree with the initial "proof."
