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post by
brian_dc
at 2005-12-10 03:44:19
whiskey_weed_and_women said:
ha prove it, PROVE IT !!!!!
If we define two values on the domain [0, 4] (represent years, since before college I was not a math major and after college I will no longer be a math major) as x=my being a college student and y=my majoring in mathematics. We wish to prove that these two statements are uniformly continuous over some given statement of f(x)
f: [0,4]--> R f(x)=x^2+x (note, by a theorem, the proof could end here with a statement of the fact that any polynomial is continuous, therefore the function is continuous. The theorem states that if the function is defined by continuous function over a compact interval (which [0,4] is since it is a closed and bounded set] it is uniformly continuous over that interval.
I will utilize the episilon-delta (E, d) method of proving uniform continuity for exercise sake anyway.
Let E>0. Assume x and y exist on [0,4]. Then |x-y|< d (from result below E/9)
|f(x)-f(y)|=|(x^2+x)-(y^2+y)=|(x^2-y^2)+(x-y)|=|(x+y)(x-y)|+|x-y|
at this point, consider that the greatest (x+y) can be equal to is if it is equal to the sum of the greatest upper bound of the domain = (4+4)=8
we can then say that |(x+y)(x-y)|+|x-y|<|(4+4)(x-y)|+|x-y|=8|(x-y)|+|x-y|
set u=x-y
8|u|+|u| = 9|u| re-substitute --> 9|x-y| < E\9
so...there ya go...my being a math major in college is uniformly continuous over the domain of 0 to 4 years for the continuous function x^2+x
you're probably asleep already
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