Two Characterizations of Quasiconvexity
研究了定义在实线性空间凸子集上的径向半连续映射的拟凸性，给出了两个刻画，并推广了Sion极小极大定理，刻画了拟凸风险度量。
We present two characterisations of quasiconvexity for radially semicontinuous mappings defined on a convex subset of a real linear space. As applications, we obtain an extension of Sion’s minimax theorem and two characterisations of quasiconvex risk measures.