3 ms·
It looks so innocuous when you write it as (A B)_ij = A_ik B_kj.
by contravariant 5y ago
It looks so innocuous when you write it as
(A B)_ij = A_ik B_kj.
- ogogmad 5y agoUsing the Einstein convention*. Otherwise that can be read wrong. * https://en.wikipedia.org/wiki/Einstein_notation https://en.wikipedia.org/wiki/Einstein_notation
- deleted 5y ago[deleted]
- deleted 5y ago[deleted]