Hi, could you please recommend me some books/articles where I could find information about compact subgroups of metric topological compact (abelian) groups? Thanks in advance for any help. 



Recommend a book about compact subgroups
1- "*The structure of compact groups*", written by "*Karl Heinrich Hofmann*" and "*Sydney A. Morris*", 2nd edition, 2006 (for a newer version, 2020, see <https://doi.org/10.1515/9783110695991>).


2-"*Representations of Finite and Compact Groups*", written by "*Barry Simon*", 1995, published by American Mathematical Society (AMS).


3-"*Introduction to the Representation Theory of Compact and Locally Compact Groups*", written by "*Alain Robert*", 1983, published by Cambridge University Press (see <https://doi.org/10.1017/CBO9780511661891>).


The first time I heard about topological groups was at a harmonic analysis course during my master, the lecturer was Mohammad Tabatabei (<https://www.researchgate.net/profile/Smohammad-Tabatabaie-2/research>).


