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First Note on the Definition of S2-ConvexityDOI: 10.4236/apm.2011.11001, PP. 1-2 Keywords: Convex, S-convex, s-convex, s2-convex, S2-Convex, Real Function Abstract: In this short, but fundamental, note, we start progressing towards a mathematically sound definition of the real functional classes 2sK
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