ilegal protecţie Oricare f x y f xo yo Suna inapoi releu Lil
SOLVED: 70. Show that if z f(x; y) is differentiable at Xo (xo, Yo) then f(x) f(xo) Vf(xo) (X Xo ) lim = 0 Xu Xo [Hint: Use Definition 14.4.7 directly:]
Necessary and sufficient conditions such that extended mean values are Schur-convex or Schur-concave