What properties does this inequality use?

by Xeh Deng   Last Updated July 12, 2019 10:20 AM - source

enter image description here enter image description here Dear every one today I enconter an inequality like this: in his paper he did not give the reasons. Since I do not major in Math so could any one help me to give a simple illustration for it? It seems like Sobolev space function's property

Tags : real-analysis

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