Quasi Fricke Polygons and the Nielsen Convex Region.

Norman Purzitsky

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A function $f : I \to ℝ$ , where $I \subseteq ℝ$ is an interval, is said to be a convex function on $I$ if $f (t x + (1 - t) y) \leq t f (x) + (1 - t) f (y)$ holds for all $x, y \in I$ and $t \in [0, 1]$ . There are several papers in the literature which discuss properties of convexity and contain integral inequalities. Furthermore, new classes of convex functions have been introduced in order to generalize the results and to obtain new estimations. We define some new classes of convex functions that we name quasi-convex, Jensen-convex, Wright-convex, Jensen-quasi-convex and Wright-quasi-convex...