RGMIA digitization. CAVAL 2011

1. The 'n' in fn(x) (abstract) is subscript
2. The 'th" in nth (abstract) is superscript
3. 5 mathematical equation in abstract indicated with ***. Abstract removed  Lyn 27/9/12. Permission granted, in perpetuity, RGMIA verson. liz 6/9/12