Answer to an open problem about stochastic comparison of parallel systems with geometric components
Mao and Hu  left an open problem about the hazard rate order between two parallel systems of n geometric components. Du et al.  solved the problem for n=2. Wang  gave the answer to the problem for n up to 9. In this short note, we solve the open problem for any n.
Operations Research Letters
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Affouf, Mahmoud and Wang, Jiantian, "Answer to an open problem about stochastic comparison of parallel systems with geometric components" (2023). Kean Publications. 214.