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8/18/2019 Limit Eak 4 Gaia
1/2
f : D ⊂ R → R a ∈ D
l ∈ R
limx→a
f (x) = l
∀ > 0 ∃δ > 0 /
0 < |x− a| < δ
x ∈ D⇒ |f (x)− l| < .
a
l
limx→a
f (x) = ∞
∀M > 0 ∃δ > 0 /
0 < |x− a| < δ x ∈ D
⇒ |f (x)| > M .
limx→∞
f (x) = l limx→∞
f (x) = ∞
±∞
limx→a
f (x) = l
limx→a
g (x) = m
limx→a
(f + g) (x) = l + m
limx→a
(f g) (x) = lm
m = 0
limx→a
1
g (x) = 1
m
limx→a
f
g (x) = l
m
ρ > 0 / 0 < |x− a| < ρ ⇒ h (x) ≤ f (x) ≤ g (x)
limx→a
g (x) = limx→a
h (x) = l ⇒ limx→a
f (x) = l .
8/18/2019 Limit Eak 4 Gaia
2/2
f a l
limx→a+f (x) = l
∀ > 0 ∃δ > 0 / 0 < x− a < δ ⇒ |f (x)− l| < ,
l limx→a−
f (x) = l
∀ > 0 ∃δ > 0 / 0 < a− x < δ ⇒ |f (x)− l| < .