various operations on permutations and pipe dreams
http://books.google.com/books?id=9pONax2R-mgC&pg=PA312&lpg=PA312#v=onepage&q&f=false
various operations on permutations and pipe dreams
http://books.google.com/books?id=9pONax2R-mgC&pg=PA312&lpg=PA312#v=onepage&q&f=false