Semi-continuity of Complex Singularity Exponents in Singular Central Fiber Cases

In this new version, we add the proof of the main theorem when the central fiber is not necessarily simple normal crossing. We also correct some typos.Comment: 24 page

Construction of hyperbolic Horikawa surfaces

We construct a Brody hyperbolic Horikawa surface that is a double cover of $\mathbb{P}^2$ branched along a smooth curve of degree $10$. We also construct Brody hyperbolic double covers of Hirzebruch surfaces with branch loci of the lowest possible bidegree.Comment: 16 pages; comments are very welcome. Final version, to appear in Annales de l'Institut Fourie

Xi’an the Current Situation of College Badminton Teaching and Promotion Strategies

Based on the current Xi’an City ordinary university badminton teaching research, found the problems and shortcomings existed in current teaching. At the same time has put forward its reform, promotion strategy, and strive to provide a theoretical basis for the development of Xi’an city college badminton teaching