Geodesic
A Convexity Result for Weak Differential Inequalities
Canadian mathematical bulletin, Tome 19 (1976) no. 2, pp. 235-244

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In this note we present a natural “weak” form of a certain convexity estimate for evolution inequalities as given in Agmon-Nirenberg’s paper [1], p. 139 (see also A. Friedman [2], Theorem 4.2 and 4.3). Our proof will follow that given in [1] and [2] with the natural modifications due to the enlargement of the class of solutions which are taken into account. 
Zaidman, S. A Convexity Result for Weak Differential Inequalities. Canadian mathematical bulletin, Tome 19 (1976) no. 2, pp. 235-244. doi: 10.4153/CMB-1976-037-4
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     title = {A {Convexity} {Result} for {Weak} {Differential} {Inequalities}},
     journal = {Canadian mathematical bulletin},
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     year = {1976},
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