Prof. Gui Changfeng from HNU Mathematics Research Institution cooperated with his peers to complete the paper "The sphere covering inequality and its applications". The paper was published online by theInventiones Mathematicae, a world top mathematics journal. It is HNU's second published paper on the world’s top-four mathematics journals, after the other one published on Acta Mathematica in 2016.

This paper provides solutions to the conjecture of the best constant for the Moser-Trudinger type inequalities raised by Sun-Yung Alice Chang in 1987.

Prof. Gui has been long committed to partial differential equation study, and published more than 50 papers on international first-class mathematics journals, including the top ones such asAnnals of MathematicsandInventiones Mathematicae. He received prestigious titles of Changjiang Distinguished Professor from the Ministry of Education in 2007, and has been a Chinese "Thousand Talents" expert since 2011.

Inventiones Mathematicaeis one of the four most prestigious mathematics journals in the world, together withActa Mathematica,Annals of Mathematics, andJournal of the American Mathematical Society.