Euclidean norm

The ℓ^2-norm (also written "l^2-norm") left bracketing bar x right bracketing bar is a vector norm defined for a complex vector x = [x_1 x_2 ⋮ x_n] by left bracketing bar x right bracketing bar = sqrt( sum_(k = 1)^n ( left bracketing bar x_k right bracketing bar )^2),

angle bracket | L^1-norm | L^2-space | L^∞-norm | parallelogram law | vector norm