Note that the subscript letters 'p' and 'q' and superscript characters '∞', 't' and 'π' have not been copied correctly and the fractions have been written in a single line.
RGMIA digitization. CAVAL 2011.  Abstract removed  Lyn 26/9/12. Permission granted, in perpetuity, RGMIA version. liz 7/9/12