Likelihood notation

The likelihood of a piece of evidence $e$ according to a hypothesis $H,$ known as "the likelihood of $e$ given $H$", is often written either $\mathcal L_e(H)$ or $\mathcal L(H \mid e).$ The latter notation is confusing, because then $\mathcal L(H \mid e) = \mathbb P(e \mid H).$ Many students of statistics find it hard enough to keep the difference between $\mathbb P(H \mid e)$ and $\mathbb P(e \mid H)$ straight in their heads if we don't occasionally swap the order of the arguments when talking about similar functions, so on Arbital, we much prefer the notation $\mathcal L_e(H) = \mathbb P(e \mid H).$

[fixme: Make this a child of 'likelihood' when 'likelihood' exists.]