15 Sep
2011
15 Sep
'11
03:13
2011/9/15 vasil vasil.s.d@gmail.com:
Take a look at: http://en.wikipedia.org/wiki/Closure_%28computer_science%29
Or here: http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-20.html
It is a really fundamental Scheme functionality.