User:Limeheadnyc/Sandbox

Testing some math symbols:

$S=\int d^{3}x\varphi (x)(-{\partial }^2+m^2)\varphi (x).$

$S=-[\sum _{x,\hat{\mu }}\varphi (x)(\varphi (x+\hat{\mu })+\varphi (x-\hat{\mu }))]+(6+m^2)\sum _x{\varphi }^2(x)$

$G(x,y,z)\equiv ⟨\varphi (x,y,z)\varphi (0,0,0)⟩$

$\tilde{G}(z)=\sum _{x,y}G(x,y,z)$

$G(\mathbf{𝐱})=\int \frac{d^{3}p}{(2\pi {)}^3}\frac{e^{-i\mathbf{𝐩}\cdot \mathbf{𝐱}}}{{\mathbf{𝐩}}^2+m^2}$