4 ms·
This is a bit of a red herring - why would people using Einstein notation write A[i] B[i] instead of writing A⋅B?
by joppy 8y ago
This is a bit of a red herring - why would people using Einstein notation write A[i] B[i] instead of writing A⋅B?
- feanaro 8y agoThey wouldn't. My point was that A⋅B is also hiding a sum across all indices, just like Einstein notation. The sum never changes and is therefore visual/cognitive noise, once you've understood it the first time. The dot product is an abstraction that hides it and makes it implied.