I need a reference for field extension and Galois extension (like an introduction) please.


Thank you.



Reference book for Galois extension
There are many references for such topics. As @DieterKadelka suggested, the book by Lang is a really good reference. You may also be interested in the following ones:


*Bastida, J. R. (1984). Field Extensions and Galois Theory. Cambridge University Press*


*Edwards, Harold M. (1984). Galois Theory. Graduate Texts in Mathematics. 101. New York: Springer-Verlag*


*Hungerford, T. (2012). Abstract Algebra: An introduction. 3rd ed.*


*Girardi, M; Israel, G. (1976). Teoria dei campi. Feltrinelli Editore Milano*


