This is a Norm for a Linear Map. Definition With V,W be Real Number or Complex Number Vector Spaces With T:V→W as a Linear Map With ∣∣⋅∣∣v as a Norm for V With ∣∣⋅∣∣w as a Norm for W Then, operator norm ∣∣T∣∣op=sup{∣∣T(v)∣∣w:∣∣v∣∣v≤1}