00326nam a2200097Ia 4500008004100000082001700041100002100058245007700079260005000156300002200206260320b        |||||||| |||| 00| 0 eng d  a516bP843.GD  aPorteous, Ian R.  aGeometric differentiation for the intelligence of curves and surfacesb/  aCambridge:bCambridge University Press,c1994  axiii, 301p. Index