KaTeX
E
≜
Σ
→
Z
⊎
C
B
≜
Σ
→
B
C
≜
Σ
→
Σ
Σ
≜
V
→
Z
⊎
C
\begin {array}{lcl} \mathbf {E} & \triangleq & \Sigma \rightarrow \mathbb {Z}\textcolor {blue}{\ \uplus \ \mathbf {C}}\\ \mathbf {B} & \triangleq & \Sigma \rightarrow \mathbb {B} \\ \mathbf {C} & \triangleq & \Sigma \rightarrow \Sigma \\[0.2em] \Sigma & \triangleq & \mathcal {V} \rightarrow \mathbb {Z}\textcolor {blue}{\ \uplus \ \mathbf {C}} \end {array}
MathJax 2.7
x
[
n
]
e
i
2
π
n
s
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N
⟷
X
[
k
−
s
]
.
MathJax 4 CHTML
∇
⃗
×
F
⃗
=
(
∂
F
z
∂
y
−
∂
F
y
∂
z
)
𝐢
+
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∂
F
x
∂
z
−
∂
F
z
∂
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)
𝐣
+
(
∂
F
y
∂
x
−
∂
F
x
∂
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)
𝐤
\vec{\nabla} \times \vec{F} = \left( \frac{\partial F_z}{\partial y} - \frac{\partial F_y}{\partial z} \right) \mathbf{i} + \left( \frac{\partial F_x}{\partial z} - \frac{\partial F_z}{\partial x} \right) \mathbf{j} + \left( \frac{\partial F_y}{\partial x} - \frac{\partial F_x}{\partial y} \right) \mathbf{k}
MathJax 4 SVG
cos
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θ
+
ϕ
)
=
cos
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θ
)
cos
(
ϕ
)
−
sin
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θ
)
sin
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ϕ
)
\cos(\theta+\phi)=\cos(\theta)\cos(\phi)−\sin(\theta)\sin(\phi)