The Kronecker delta δij\delta_{ij}δij is a function of the two variables iii and jjj defined by δij={0if i≠j1if i=j.\delta_{ij} = \begin{cases}0 & \text{if }i\neq j \\ 1 & \text{if } i=j.\end{cases}δij={01if i=jif i=j.
Wikidata ID: Q192826