Could you provide some easy examples for positive mean curvature surfaces?

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I want to see some examples on positive mean curvature surfaces (not necessary constant mean curvature). I can't find a source for this. Could you provide some examples (It would be better with calculations). Thank you.

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Sphere, or some quadric in $\mathbb{R}^3$, e.g. $\{(x,y,z)\ |\ z=x^2+y^2 \}$. But in general, you can check any Surface text book