However , the set of linear functions is n't complete , and the orthogonal variables are n't fast or random if nonlinearity in A ( \\ displaystyle A ) comes into play .
This leads to the Mori projection operator .
The set of linear functions is n't complete , and the orthogonal variables are n't fast or random if nonlinearity in A ( \\ displaystyle A ) comes into play .
This leads to the Mori projection operator .