This book addresses only Nonlinear Programming Theory.
You will not find any algorithms, so that this book is not very practical. I also think the choice of topics could be better.

So, why 5 stars ?

Because of the writing style.

That is, what I like most in this book is the way that Mangasarian wrote it. References to all important equations, definitions, etc. No use of english to explain math subjects but well defined equations. Concise exposition and proof of theorems using math simbols. That is: Math simbols to explain mathematics. Very clear style.

A very good example of how to write an excellent, didactic, precise and clear math book.