A pointwise inequality for a biharmonic equation with negative exponent and related problems

Quôc Anh Ngô, Van Hoang Nguyen, Quoc Hung Phan

Inspired by a recent pointwise differential inequality for positive bounded solutions of the fourth-order Hénon equation ${\Delta }^{2}u=|x{|}^a{u}^p$ in ${\mathbb{R}}^n$ with $a⩾0$…