Summary
The aim of this paper is to show that the product of nonlinear concave nondifferentiable functions which take nonnegative values, is strictly quasi concave. If the functions are concave differentiable and positive the product function is shown to be pseudo-concave.
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Sinha, S.M., Jain, O.P. On indefinite programming problems. Zeitschrift für Operations Research 18, 41–45 (1974). https://doi.org/10.1007/BF01949712
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DOI: https://doi.org/10.1007/BF01949712