Help with Herbelin

DISCLAIMER: I'm uneducated with PLT and don't know what I'm talking about, so please forgive any whacked terminology.

Ok, that outta the way...

I'm trying to make my way through The Duality of Computation (, and this stuff, like most everything posted on this fascinating website, is way over my head. I can't follow most of the back half of the paper, but I was hoping someone might have the spare time to answer two newbie, school-level, questions...

1) (The silly one.) How on earth do you pronounce the "mu, mu with tilde" calculus. It'd literally be easier to read this if I knew how to read it. Is there some definitive guide for people who just figured out that the funny squiggle so many these papers is pronounced "eta"? :)

2) (The basic one.) The authors talk about the call-by-value side of the duality as dealing with "Environments with holes." This reminds me of PTS, with it's capital-PI lambda expressions that can close over terms or types. What's the difference between an "Environment with a hole" and a lambda over environments? And what does that mean for compiled languages, where environments aren't parameters?

Any help on either question would be appreciated.