IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
pair support double sum11 1. n : 2. m : 3. f : nm 4. x1 : n 5. x2 : n 6. y1 : m 7. y2 : m 8. x1 = x2y1 = y2 9. x:n, y:m. (x = x1 & y = y1) (x = x2 & y = y2) f(x,y) = 0
10. x1 = x2 11. x : n 12. x = x1 sum(f(x,y) | y < m) = 0