Approximation methods, 2nd edition

This book is a 2nd edition containing a new chapter. It presents the theory of numerical iterative methods to solve systems of linear equations. It also contains the proofs of iterative methods to solve the equation f(x)=0 and the proofs of polynomial interpolation method. Finally, it presents some proofs of approximation methods to calculate a defined integral. It is not required for the reader to have a previous knowledge on numerical methods.