F
=
G
m
1
m
2
r
2
F = G\frac{m_1 m_2}{r^2}
F
=
G
r
2
m
1
m
2
H
(
X
)
=
−
∑
i
p
(
x
i
)
log
2
p
(
x
i
)
H(X) = -\sum_i p(x_i)\log_2 p(x_i)
H
(
X
)
=
−
∑
i
p
(
x
i
)
lo
g
2
p
(
x
i
)
∫
a
b
f
′
(
x
)
d
x
=
f
(
b
)
−
f
(
a
)
\int_a^b f'(x)\,dx = f(b) - f(a)
∫
a
b
f
′
(
x
)
d
x
=
f
(
b
)
−
f
(
a
)
O
(
n
log
n
)
O(n \log n)
O
(
n
lo
g
n
)
E
[
R
i
]
=
R
f
+
β
i
(
E
[
R
m
]
−
R
f
)
E[R_i] = R_f + \beta_i (E[R_m]-R_f)
E
[
R
i
]
=
R
f
+
β
i
(
E
[
R
m
]
−
R
f
)
F
=
m
a
F = ma
F
=
ma
∂
V
∂
t
+
1
2
σ
2
S
2
∂
2
V
∂
S
2
+
r
S
∂
V
∂
S
−
r
V
=
0
\frac{\partial V}{\partial t} + \frac{1}{2}\sigma^2 S^2 \frac{\partial^2 V}{\partial S^2} + rS\frac{\partial V}{\partial S} - rV = 0
∂
t
∂
V
+
2
1
σ
2
S
2
∂
S
2
∂
2
V
+
r
S
∂
S
∂
V
−
r
V
=
0
∇
⋅
E
=
ρ
ε
0
\nabla \cdot \mathbf{E} = \frac{\rho}{\varepsilon_0}
∇
⋅
E
=
ε
0
ρ
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