1. The structure of solutions near a degenerate line for mixed type equations in gas dynamics Open Access Author: Zhang, Tianyou Title: The structure of solutions near a degenerate line for mixed type equations in gas dynamics Graduate Program: Mathematics Keywords: two-dimensional Riemann problempressure gradient equation2-D steady Euler equationscharacteristic analysis File: Download 1-TianyouZhang-Dissertation.pdf Committee Members: Yuxi Zheng, Dissertation Advisor/Co-AdvisorAlberto Bressan, Dissertation Advisor/Co-AdvisorKris Jenssen, Committee MemberGary Stuart Settles, Committee MemberYuxi Zheng, Committee Chair/Co-ChairAlberto Bressan, Committee Chair/Co-Chair