If you have the book (physical or digital), here is how to master it:

Don't skip early chapters on algebra and matrices; they are foundation stones. Conclusion

Errata from previous editions have been corrected, and complex proofs have been broken down into more digestible logical steps.

Cauchy-Riemann equations and Residue theorem.

Downloading pirated PDFs breaks intellectual property laws.

: Forms the backbone of modern digital signal processing and discrete time systems. Unit VII: Numerical Techniques & Statistics