How the learning rate (step-size parameter) affects stability and speed.
If you are comparing this to previous editions (like the 4th), the significant updates include: simon haykin adaptive filter theory 5th edition pdf
The powerful but computationally expensive cousin of LMS. The 5th edition excels here, showing how the matrix inversion lemma leads to the RLS recursion. Haykin contrasts the fast convergence (order of magnitude faster than LMS) with the stability risks of RLS in time-varying environments. simon haykin adaptive filter theory 5th edition pdf