I could be wrong about this, but I believe the arrow is intended to indicate a functional mapping, and the [] is some noise about types. So: The probability that (this computation yields a lambda mapping A to O) given (rest of universe).
It would be nice if someone weighed in with something more definitive. Various reference materials, along with search tools such as Google and Symbolhound, are not particularly helpful.
I could be wrong about this, but I believe the arrow is intended to indicate a functional mapping, and the [] is some noise about types. So: The probability that (this computation yields a lambda mapping A to O) given (rest of universe).
It would be nice if someone weighed in with something more definitive. Various reference materials, along with search tools such as Google and Symbolhound, are not particularly helpful.