----------------------------

Research interest

Problems that might be intractable without the use of set theory. 

 ----------------------------

Publication

• (with J.He, S.Zhang) Selectivity of ultrafilters over the set of natural numbers (in Chinese), Sci Sin Math, 2026.

• (with Y.Zhou,J.He,S.Zhang) Two observations on extremely disconnected topological groups, Topol  Appl., 2025.

• (with S.Zhang) Filter-Menger set of reals in Cohen extensions, MLQ, 2024.
  

• (with J. He and S.Zhang) Splitting positive sets, Sci. China Math., 2023.

•  (with S.Zhang) Capturing topological spaces by countable elementary submodels， Houston J  Math,  48(1), 2022 (appear in 2023).

• (with X.G. Zhou and S. Lin) I_sn-sequential spaces and the images of metric spaces, Topol Appl., 2023.
  

• (with X. He and S. Zhang) More on ideal limit points, Topol Appl., 2022. 

•  (with X. He  and S.Zhang) The Borel comlexity of ideal limit points, Topol Appl., 2022. 

• (with S. Zhang) Some applications of the theory of Katetov order to ideal convergence, Topol Appl., 2020.

•  On inverse preservation of regular G_delta diagonals, Q&A in General Topology, 2018.

•  (with S. Zhang) Monotone normality, the cardinal cov(N) and D-spaces, Houston J  Math, 2014.

•  (with W.-X. Shi) Monotone normality and neighborhood assignments, Topol Appl., 2011.

•  (with W.-X. Shi) A note on D-spaces, Topol Appl.,2011.

•  D-spaces and dual properties, PhD thesis, Nanjing University, 2011.

------------------------