A Note on the Concavity Property of Homogeneous Functions
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概要
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This note has two aims. One is to assert that, for a positive function in Rn++, Friedmans Theorem (1973, Theorem 2) holds without the non-decreasingness property in his Assumption 1. The other is to propose a similar theorem based on his theorem and then to show that Eichhorns theorem (1981, Collorary 2) is derived from our theorem.
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