Sujet: concave liste de sujets
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	Concavity of f(g)		2001-10-25
		Troy pose la question : Suppose f & g are both concave upward on (-infinity,infinity). Under what condition on f will the composite function h(x)= f(g(x)) be concave upward? Walter Whiteley lui répond.
	Concavity		2000-10-22
		Alex pose la question : the question is: on what interval is f(x)=(x2)(ex)? ive found the 2nd derivative which is ex(x2+4x+2) and i did the quadratic to get -2-20.5 and -2+20.5, but i dont know what the interval is. Harley Weston lui répond.

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