[Smaug123]

It didn't exactly escape confinement; rather, I originally wrote much of this content for internal purposes and then realised it would be good to publish it externally.

True, since I linked "closure" I should probably have linked the main topic of the article. Honestly, though, I'm not sure the Wikipedia article is very comprehensible at all; I'm hoping mine is more so.

[samatman]

It's not a great Wikipedia entry, agreed.

I was left wondering if the topic is inherently that difficult or if this is just another case of le Wik being kinda dense for maths and comp sci. Looking around a bit at other links in this thread, I'm gathering it's the latter.