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Jul 21, 2018 at 10:04 comment added Đào Thanh Oai Allow me adding condition $f''_{xy}>0$ $f''_{yx}>0$ ??
Jul 21, 2018 at 9:46 comment added Đào Thanh Oai $f(x,y)=xy$ or $f(x,y)=(x+y)^2$ the inequality above is also true. Dear Sir @MaxAlekseyev
Jul 21, 2018 at 9:41 comment added Đào Thanh Oai Which condition is the inequality abovetrue?
Jul 21, 2018 at 8:37 history answered Max Alekseyev CC BY-SA 4.0