On the morning of December 27, 2019, Prof. Shaohui Wang from Louisiana College was invited to visit our faculty and gave a report to teachers and students at 201.

Prof. Shaohui Wang made a report entitled "A_α-Spectral Radius of Cacti", professor Wang first introduced the basic concept of A_α-spectral radius, then gave some new results on the A_α-spectral radius of cacti.

The content of the report is rich and substantial, which broadens the view of the present teachers and students and benefits them a lot.