There are some good summaries here, too: http://stackoverflow.com/questions/93526/what-is-a-y-combinator/6714066 http://stackoverflow.com/questions/93526/what-

There are some good summaries here, too: http://stackoverflow.com/questions/93526/what-is-a-y-combinator/6714066 http://stackoverflow.com/questions/93526/what-is-a-y-combina... Full disclosure: I ended up answering there as well, but I won't say which one is mine.