... Y , Bj CN j = 1 C2 where ¡â ̧¢®Y Є ( D * ) is the increment of Y over the rectangle Bj . Here , ¡â [ b , c ] Y = Y ( 1 ) ¡¤¡¤¡¤ = [ Y ( c1 , t2 , ... , tN ) — Y ( b1 , t2 , ... , tx ) ] | 82 suitably differentible then one has bN CN bN = etc. If ...