I'm wondering, for $x_n \in \mathbb{R}^k$, whether $x_n \to x$ iff $x_n^p \to x^p$, for $p=1,\cdots,k$.
The equivalence is direct for the standard Euclidean norm, norm defined by maximum of it component, and $L2$ norm.
If a distance satisfies the symmetry and triangle inequality, does this distance also means the two conditions are equivalent?