The foundations of mathematics is quite an interesting subject in its own right. However I have not yet come across any good writing that can make this issue and its discussion clear to me. Still the topic is highly mysterious to me because the available writings on the net ( which I have been able to find) are too diffused and also because it is rare that something is said about the foundations in any book on mathematics.
Can somebody please refer me to some book or available writing that can make this issue clearer to me ? It would be better if the available writing was available online.