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Communicated by M. M. Schiffer
The author wishes to thank Professor M. M. Schiffer for his encouragement and help during the preparation of this paper.
This work was supported by the Swiss National Foundation of Science.
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Bandle, C. Mean value theorems for functions satisfying the inequality Δu+Keu≧0. Arch. Rational Mech. Anal. 51, 70–84 (1973). https://doi.org/10.1007/BF00275994
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DOI: https://doi.org/10.1007/BF00275994