Einstein Summation Notation
Convention
Einstein’s Summation notation leaves off the sum with the dummy index. Thus, \(\sum_k a^k|k\rangle = a^k|k\rangle\). So look at any unused index that is in the expression to determine what the sum is over.
Einstein’s Summation notation leaves off the sum with the dummy index. Thus, \(\sum_k a^k|k\rangle = a^k|k\rangle\). So look at any unused index that is in the expression to determine what the sum is over.
Created: 2023-06-25 Sun 02:25