TY - BOOK AU - Chen,Chuanqiang AU - Ma,Xinan AU - Salani,Paolo TI - On Space-Time Quasiconcave Solutions of the Heat Equation T2 - Memoirs of the American Mathematical Society Series SN - 9781470452438 AV - QA377 .C446 2019 U1 - 515/.353 PY - 2019/// CY - Providence PB - American Mathematical Society KW - Heat equation-Numerical solutions KW - Electronic books N1 - Cover -- Title page -- Chapter 1. \040Introduction -- Chapter 2. Basic definitions and the Constant Rank Theorem technique -- 2.1. Preliminaries -- 2.2. A constant rank theorem for the space-time convex solution of the heat equation -- 2.3. The strict convexity of the level sets of harmonic functions in convex rings -- Chapter 3. A microscopic space-time Convexity Principle for space-time level sets -- 3.1. A constant rank theorem for the spatial second fundamental form -- 3.2. A constant rank theorem for the space-time second fundamental form: CASE 1 -- 3.3. A constant rank theorem for the space-time second fundamental form: CASE 2 -- Chapter 4. The Strict Convexity of Space-time Level Sets -- 4.1. The strict convexity of space-time level sets of Borell's solution -- 4.2. Proof of Theorem 1.0.3 -- Chapter 5. Appendix: the proof in dimension =2 -- 5.1. minimal rank =0 -- 5.2. minimal rank =1 -- Bibliography -- Back Cover N2 - In this paper the authors first obtain a constant rank theorem for the second fundamental form of the space-time level sets of a space-time quasiconcave solution of the heat equation. Utilizing this constant rank theorem, they obtain some strictly convexity results of the spatial and space-time level sets of the space-time quasiconcave solution of the heat equation in a convex ring. To explain their ideas and for completeness, the authors also review the constant rank theorem technique for the space-time Hessian of space-time convex solution of heat equation and for the second fundamental form of the convex level sets for harmonic function UR - https://ebookcentral.proquest.com/lib/orpp/detail.action?docID=5788263 ER -