On Space-Time Quasiconcave Solutions of the Heat Equation(Memoirs of the American Mathematical Society)

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出版时间
2019年07月30日
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ISBN
9781470435240
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页      码
83
语      种
英文
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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.
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