Quote (Hammer_Hdin @ Jul 10 2010 01:43am)
I still think that 0.999... = 1, but there is one thing which I am uncertain of.
If you add 0.999... + 0.333... you get 1.333... with a 2 on the end, but this 2 does not exist because it is after an infinite amount of 3's. If you added it up a thousand, a million or a billion times even, the number at the end would never get near infinity. But let's just say that you have this equation: 1 - 0.999... = 0.000... 1 = 0
But let's say we had (1-0.999...)+(1-0.999...)+(1-0.999...)+(1-0.999...)+(1-0.999...) = 0.000... 5, but once again the 5 is ignored because infinity - 1 digit = infinity.
But what if it was (1-0.999...)+(1-0.999...)+(1-0.999...)... meaning you add the numbers in brackets infinity times.
Would the "error" on the end of the infinite series eventually end up so large (infinity digits) that it would replace the numbers that are before the infinite series, and the series itself?
I suppose it sort of revolves around the concept of infinity - infinity = undefined.
Please explain.
Ok, I've tried telling you this already.
Look. 0.000...1 is NOT a real number.
You CANNOT say that 1 - 0.999... = 0.000...1 = 0. This is FALSE because 0.000...1 is not a real number.
The correct way is: 1 - 0.999... = 0. That's it.
It is exactly equal to 0. Nothing is ignored. There is never a 1 after the 0s.So, (1-0.999...)+(1-0.999...)+(1-0.999...)+(1-0.999...)+(1-0.999...) = 0, because each (1 - 0.999...) equals 0. There is never any 1 after any 0s.
There is no "error" anywhere.
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The concept of infinity states that any number after an infinite series does not affect the number, so the 0.000...1 is actually 0.
No. Properties of the real numbers necessitate that 0.000...1 is not a real number, so 0.000...1 is NOT "actually 0"; it's...not... a...real number.
http://mathforum.org/library/drmath/view/57069.htmlAlso, infinity - infinity also makes no sense, because infinity is not a number. You can't perform algebraic operations to infinity. Infinity is very complex; there are many kinds of infinity. So saying "infinity - infinity" doesn't make any sense.