\ | f \ | _ {{ Q, 2}} = \ left (\ int | f | ^ {2} dQ \ right) ^ {{{\ frac {1} {2}}}}

\ | f \ | _ {{ Q, 2}} = \ left (\ int | f | ^ {2} dQ \ right) ^ {{{\ frac {1} {2}}}}

\ | f \ | _ {{ Q, 2}} = \ left (\ int | f | ^ {2} dQ \ right) ^ {{{\ frac {1} {2}}}}

\ | f \ | _ {{ Q, 2}} = \ left (\ int | f | ^ {2} dQ \ right) ^ {{{\ frac {1} {2}}}}