A gradient estimate for solutions of the heat equation
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Tài liệu tham khảo
A. Friedman: Partial Differential Equations of Parabolic Type. Prentice Hall Inc., Englewood Cliffs, 1964.
O. A. Ladyzenskaja, V. A. Solonnikov, and N. N. Ural'ceva: Linear and Quasilinear Equations of Parabolic Type. Amer. Math. Soc., Providence, 1968.
M. H. Protter and H. F. Weinberger: Maximum Principles in Differential Equations. Prentice Hall Inc., Englewood Cliffs, 1967.