By Constantin Banica, Octavian Stanasila
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Time to haul out your calculator. ) choices for a and b. What are they? 6: This all in hand, what is the conclusion telling us? ” If we specify to our particular situation (insert our particular f , a, and b) this means . . 7: Is your intuition satisﬁed that x as claimed exists? Can you approximate its value? (“SOLVE” on your calculator might yield x such that f (x) = 0, but x is not in the interval (a, b). As far as the conclusion of the theorem goes, that isn’t of interest. The theorem gives a point in the open interval, so you have to ﬁnd that one (or ones?
And doesn’t attempt to say anything about why the trip was made. But it’s easy to remember and captures the theorem quite precisely. 13: Repeat the work above with f deﬁned by f (x) = ex − xe−x − 2. 2 Also, if trying x3 hinted at of another version of the theorem, hold that (good) thought. 2 43 Why These Hypotheses? We now have some understanding of what the theorem means. However, the examples above don’t make it clear whether the continuity assumption is important. Could we guarantee the same conclusion without assuming continuity of the function on the closed interval (either assuming no continuity, or perhaps only continuity on the open interval (a, b))?
Explore with some more functions. Can you construct an example of a function with a right-hand limit of 5 at the point x = 3? Right-hand limit 5 and left-hand limit 2 at the point 3? Right-hand limit 5 and with no limit? A function with right-hand limit 5 and with no left-hand limit? A function with neither right-hand nor left-hand limit? 22, continued) Armed with the preceding deﬁnitions, we may give the following. 4 We say that f is continuous on [a, b] if f is continuous at each point of (a, b), limx→b− f (x) = f (b), and limx→a+ f (x) = f (a).