L2 norm

${\displaystyle L^{2}}$-Standard denotes:

• a norm on the space of square integrable functions, see Lp space # The Hilbert space L2

${\displaystyle \ell ^{2}}$-Standard denotes:

• the norm on the space of square summable sequences, see sequence space # lp

This is a disambiguation page for differentiating between several terms identified with the same word.