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This special issue is dedicated to Professor Weiyi Su for the celebration of her 80th birthday and for honoring her more than 50 years’research and education career in math-ematics.rnProfessor Su was born in Yichang,Hubei Province,China in 1938.She joined the De-partment of Mathematics of Nanjing University(NJU)as an assistant professor after her five-year undergraduate study there from 1956 to1961.During the period of 1984-1988 she visited the University of New Mexico in USA.After returning to Nanjing University she was promoted to full professor in 1988,and then became a member of the PhD super-vision faculty in 1992.She had been the Head of Mathematics Department of NJU and the Director of the Committee of Mathematics Popularization of Mathematical Society of Jiangsu Province from 1993 to1998.From 1999 to 2012 she had been also a vice-chairman of the Committee of Mathematics Popularization of the Mathematical Society.She taught advanced mathematics at Kuang Yarning Honors School,NJU for more than 18 years(1997-2015),even after her official retirement in 2008.As one of the early sponsors,Professor Su had served for a long time(1986-2015)as the Executive Editor of Analysis in Theory and Applications,which is partially sponsored by Mathematics Department of NJU.