Recently, M. Bencze, C. P. Niculescu and F. Popovici [2] have introduced a notion of 2-dimensional convexity for functions of several variables, together with an analogue of Jensen's inequality. We present here an alternative argument, based on a result due to D. D. Adamovi? and P. M. Vasi? [1].
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机译：最近，M。Bencze，C。P. Niculescu和F. Popovici [2]为几个变量的函数引入了二维凸度的概念，并与Jensen不等式进行了比较。我们根据D. D. Adamovi的结果在此提出一个替代性论点。和P. M. Vasi？ [1]。
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