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H <br />

h, k ∈ R n H(h, k) f <br />

p Hf(p) D 2 f(p) ∇ 2 f(p) Hess f(p) <br />

Hess f(p) :=<br />

⎛<br />

⎜<br />

⎝<br />

∂x1x1f(p) . . . ∂2 x1xnf(p) <br />

<br />

∂2 xnx1f(p) . . . ∂2 xnxnf(p) X f : X → R <br />

a ∈ X f f(y) ≥ f(a) y ∈ X <br />

f(y) > f(a) y ∈ X y = a<br />

a ∈ X f f(y) ≤ f(a) y ∈ X <br />

f(y) < f(a) y ∈ X y = a<br />

X f : X → R <br />

a ∈ X f U a f(y) ≥ f(a)<br />

y ∈ U f(y) > f(a) y ∈ U y = a<br />

a ∈ X f U a f(y) ≤ f(a)<br />

y ∈ U f(y) < f(a) y ∈ U y = a<br />

<br />

X D ⊂ X f : D → R a ∈ D a f<br />

u ∈ X Duf(a) Duf(a) = 0 f a <br />

Df(a) <br />

X D ⊂ X f : D → R D a ∈ D<br />

a f Df(a) = 0<br />

X D X f : D → R p ∈ D <br />

∂uf(x) ∂vf(x) ∂u∂vf(x) p p ∂v∂uf(p) <br />

<br />

∂v∂uf(p) = ∂u∂vf(p).<br />

X = R n f<br />

H(p) = (∂i∂jf(p))ij<br />

f p Hess f(p)<br />

D ⊆ R n f ∈ C 2 (D, R) a f <br />

f ′′ (a)(h, h) f <br />

a f<br />

f ′′ (a)(h, h) f <br />

a f <br />

a f f ′′ (a)(h, h) <br />

p p <br />

H = D 2 f(p) f p<br />

D 2 f(p) <br />

<br />

p <br />

D 2 f(p) <br />

<br />

p <br />

<br />

<br />

<br />

H <br />

⎞<br />

⎟<br />

⎠ .

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