Simone Malacrida 
Introduction to Galois Theory [EPUB ebook] 

The following topics are presented in this book:
symmetric polynomials, symmetric functions, symmetric relations and Cauchy modules
Galois group and Galois theory of equations
binomial equations and fundamental theorem
inverse Galois problem and Ruffini-Abel theorem
resolutions of second, third, and fourth degree equations and monodromy