Vector Norm on Complex numbers

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How can we define a vector norm on $\mathbb{C}^n$ that is not an l$_p$-norm? I have no idea how to start.

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You can take, for instance, $\bigl\lVert(z_1,z_2,\ldots,z_n)\bigr\rVert=\lvert z_1\rvert+2\lvert z_2\rvert+\cdots+n\lvert z_n\rvert$.