QUICKEST DESCENT. 17 



But y'// and/* are infinitely smaller thanp' 

 and therefore the term, 



lected. 



I 



Therefore, — : — r- r- ^— ; — ; -,, 



V(nz*+mp'»).V (nx — mp) 



— "* y -y (n z2 -f. f» p* ) 



Also -^ . ^'';''-^"'^'' 



2^ (nx — (»;t>)| 



^my_ V(n»'+y) ; and « i* + 



2p <v^(nx* +mp*) >/('»* — w/>)4 



m/o* is infinitely smaller than ny^. ^^^ 



P 

 c 



