Corrections contributed by Steven Sam

p.11 line -5: exponents s(rho) and t(rho) should be alpha_{s(rho)} and
alpha_{t(rho)}

p.14 line -5: phi(y) should be phi(x')

p.16 line 2: change "in >= 0" to "is >= 0"

p.16 line 6: change minus sign to plus sign

p.16 line 7: change plus sign to minus sign

p.16 line 8: change plus sign to minus sign

p.23 line -4: change "definition" to "definitions"

p.24 line -7: delete last negative on c(dim X)

p.26 line 4: change delta_i to delta_j

p.28 line -7: change both occurrences of Z to Y

p.30 line 7: change Y to S