Banner: Helicity
Adjective Definition
Helicity $\delta _{z} \equiv \begin{cases} +1 \ \ &\sf{\text{if}} \ \ &\mathrm{\Delta}n^{\mathsf{U}} > \mathrm{\Delta}n^{\mathsf{D}} \\ \ \ 0 \ \ &\sf{\text{if}} \ \ &\mathrm{\Delta}n^{\mathsf{U}} \ \sf{=} \ \, \mathrm{\Delta}n^{\mathsf{D}} \\ -1 \ \ &\sf{\text{if}} \ \ &\mathrm{\Delta}n^{\mathsf{U}} < \mathrm{\Delta}n^{\mathsf{D}} \end{cases}$ X-Y
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