►A function
is convex on if
…
►A continuously differentiable function is convex iff the curve does not lie below its tangent at any point.
►►►Figure 1.4.2: Convexfunction
.
…
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A. Michaeli (1996)Asymptotic analysis of edge-excited currents on a convex face of a perfectly conducting wedge under overlapping penumbra region conditions.
IEEE Trans. Antennas and Propagation44 (1), pp. 97–101.
S. C. Milne (2002)Infinite families of exact sums of squares formulas, Jacobi elliptic functions, continued fractions, and Schur functions.
Ramanujan J.6 (1), pp. 7–149.