= Symmetric simple exclusion process
{title2=SSEP}
= Symmetric exclusion process
{synonym}
On $\mathbb Z$, put independent rate-$c$ <Poisson processes> on unoriented nearest-neighbour <edges>, and exchange their endpoint occupations at each mark. Its generator on cylinder functions is $Lf(\eta)=c\sum_x[f(\eta^{x,x+1})-f(\eta)]$. Equal occupations do not change the state, and a particle next to a vacancy jumps across at rate $c$. The <stirring representation of symmetric exclusion> constructs it for arbitrary initial configurations. The simple occupation-product <product self-duality of symmetric exclusion> requires symmetry and is not the ordinary duality of an asymmetric process.
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