A proof of an open problem of Yusuke Nishizawa for a power-exponential function

Branko Malesevic, Tatjana Lutovac, Bojan Banjac

This paper presents a proof of the following conjecture, stated by Nishizawa in [Appl. Math. Comput. 269, (2015), 146--154.]: for $0<x<\pi /2$ the inequality $ \displays…