Statistically close
The variation distance of two distributions and over a finite domain , (often referred to as statistical difference or statistical distance in cryptography) is defined as
.
![{\displaystyle \Delta (X,Y)={\frac {1}{2}}\sum _{\alpha \in D}|\Pr[X=\alpha ]-\Pr[Y=\alpha ]|}](https://wikimedia.org/api/rest_v1/media/math/render/svg/40c61a14565d1aa5b57e57c0ae90d29a68496e0f)
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Wikipedia
The variation distance of two distributions and over a finite domain , (often referred to as statistical difference or statistical distance in cryptography) is defined as
.