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Question Number 120272 by cantor last updated on 30/Oct/20

$$\phi \left(x\right)={\mathit{x}}^{\mathit{r}}$$ $$\mathit{w}\mathit{h}\mathit{e}\mathit{r}\mathit{e}\mathit{x}\in [0,+\mathrm{\infty }[\mathit{a}\mathit{n}\mathit{d}0<\mathit{r}⩽1$$ $$shownthatforany(\mathit{x},\mathit{y})\in {\mathbb{R}}_{+}^2$$ $$\mathit{\phi }(\mathit{x}+\mathit{y})⩽\mathit{\phi }\left(\mathit{x}\right)+\mathit{\phi }\left(\mathit{y}\right)$$ $$\mathit{p}\mathit{l}\mathit{e}\mathit{a}\mathit{s}\mathit{e}$$

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