Q: what does the mathematical pirate say?
A: r r r r r r r r d r d θ d ϕ ! {\displaystyle rrrrrrrr\ dr\ d\theta \ d\phi \ !}
2 A + 3 B + 4 e − → 5 C + 6 D {\displaystyle 2A+3B+4{e^{-}}{\to }5C+6D}
∂ L ∂ x ˙ = d d t ∂ L ∂ x ¨ {\displaystyle {\frac {\partial L}{\partial {\dot {x}}}}={\frac {d}{dt}}{\frac {\partial L}{\partial {\ddot {x}}}}}
e i π − 1 = 0 {\displaystyle e^{i\pi }-1=0}
x = − b ± b 2 − 4 a c 2 a {\displaystyle x={\frac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}}
G μ ν = − 8 π G T μ ν {\displaystyle G_{\mu \nu }=-8\pi GT_{\mu \nu }}
γ = 1 1 − β 2 {\displaystyle \gamma ={\frac {1}{\sqrt {1-\beta ^{2}}}}}
where β = v c {\displaystyle \beta ={\frac {v}{c}}}
∇ ⋅ D = ρ {\displaystyle \nabla \cdot \mathbf {D} =\rho }
∇ ⋅ B = 0 {\displaystyle \nabla \cdot \mathbf {B} =0}
∇ × E = − ∂ B ∂ t {\displaystyle \nabla \times \mathbf {E} =-{\frac {\partial \mathbf {B} }{\partial t}}}
∇ × H = J + ∂ B ∂ t {\displaystyle \nabla \times \mathbf {H} =\mathbf {J} +{\frac {\partial \mathbf {B} }{\partial t}}}
H ( t ) | Ψ ( t ) ⟩ = i ℏ ∂ ∂ t | Ψ ( t ) ⟩ {\displaystyle H(t)\left|\Psi (t)\right\rangle =i\hbar {\frac {\partial }{\partial t}}\left|\Psi (t)\right\rangle }
f ( x ) ∼ 1 2 a 0 + ∑ n = 1 ∞ ( a n cos ( n x ) + b n sin ( n x ) ) {\displaystyle f(x)\sim {\frac {1}{2}}a_{0}+\sum _{n=1}^{\infty }{\Big (}a_{n}\cos \left(nx\right)+b_{n}\sin \left(nx\right){\Big )}}
a n = 1 π ∫ − π π f ( t ) cos ( n t ) d t {\displaystyle a_{n}={\frac {1}{\pi }}\int _{-\pi }^{\pi }{f(t)\cos \left(nt\right)dt}}
b n = 1 π ∫ − π π f ( t ) sin ( n t ) d t {\displaystyle b_{n}={\frac {1}{\pi }}\int _{-\pi }^{\pi }{f(t)\sin \left(nt\right)dt}}
s.t.
is the complex conjugate of 
