Please someone help me! I am stuck in this problem long time.

how to express this: norm(y)^3/x^2

I have already proved this convex in my previous topic.

I would think the constraint t\geq \|y\|^3/x^2 should be equivalent to something like `geo_mean([t,x,x])>=norm(y)`

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Yes! Thank you for your help Michal, really appreciated!