Definition:Inverse Entourage

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Definition

Let $S$ be a set.

Let $\UU$ be a quasiuniformity on $S$.

Let $u \in \UU$ be an entourage of $\UU$.


Then the inverse entourage $u^{-1}$ is defined as:

$u^{-1} := \set {\tuple {y, x}: \tuple {x, y} \in u}$


Also see


Sources