Given a vector $u = (x, y, z)$ what is $\|u\|_2^2$ ?
2026-03-26 14:33:00.1774535580
What does $\|u\|^2_2$ mean?
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The $\| \cdot \|_2$ function is the $2$-norm, i.e. the standard Euclidean length of a vector. Thus, $$\|(x, y, z)\|_2^2 = x^2 + y^2 + z^2.$$