show/hide this revision's text 2 deleted 206 characters in body

I would like to know more about the history and evolution of the proper forcing.

What were the initial motivations , which are of the fundamental step use of its history (possibly with reference or date) and what are not still understood about it at present (open questions)the proper forcing.?

show/hide this revision's text 1

The history of Proper Forcing

I would like to know more about the history and evolution of the proper forcing.

What were the initial motivations, which are the fundamental step of its history (possibly with reference or date) and what are not still understood about it at present (open questions)?