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How will I prove that some function f(x) is unlimited of some set E[itex]\subseteq[/itex]D_{f}, where D_{f}is the domain of the function, or the values of x, which can be used in the function.

For example:

How will I prove that this function f(x)=x+2 is unlimited for E=R (set of real numbers)?

Спасибо за помощь!

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# Unlimited function of set E

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