We begin with the classical maximum principle due to E. Hopf [46], together with an extended commentary and discussion of Hopf’s original paper by J. Serrin [97].
CITATION STYLE
Pucci, P., & Serrin, J. (2007). Tangency and comparison theorems for elliptic inequalities. In Progress in Nonlinear Differential Equations and Their Application (Vol. 73, pp. 13–49). Springer US. https://doi.org/10.1007/978-3-7643-8145-5_2
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