Quasi–concave envelope of a function and
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Andrea Colesanti; Paolo Salani
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Article
📅
2003
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John Wiley and Sons
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English
⚖ 170 KB
## Abstract Given a __C__^2^ function __u__, we consider its quasi–convex envelope __u__\* and we investigate the relationship between __D__^2^__u__ and __D__^2^__u__\* (the latter intended in viscosity sense); we obtain two inequalities between the tangential Laplacian of __u__ and __u__\* and the