I'm reading this PDF: https://link.springer.com/content/pdf/10.1007/978-3-642-01001-9_13.pdf about order preserving encryption functions and there's this on page 9 (or 232):
It's describing the formula for the probability distribution. So I guess it's saying that the probability distribution of some variable.
What is the dollar sign, the
<- and how do I interpret this