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Re:Ask HN: How to self-study mathematics from the undergrad ... by ducttapecrown on Friday January 18, 2019 @12:06PM (#18940743)
Lattices (the algebraic structure) seem to exist only on Wikipedia in the sense that the only time I've seen lattices every mentioned in my standard undergrad education is once for a proof of the Stone-Weierstrauss theorem.

I know there are textbooks on the topic, and probably lots of people who deal with lattices a lot. But my own experience seems to be that wikipedia puts more emphasis on lattices and things like universal algebra than actually happens in math.

Re:Ask HN: How to self-study mathematics from the undergrad ... by madhadron on Friday January 18, 2019 @12:20PM (#18940855)
There is an interesting rant from Gian-Carlo Rota on why lattices are so rarely taught despite being so ubiquitous. I include them based on the amount of use I have gotten out of them over the years. For example, the entire theoretical structure of eventual consistency is "make your merge operation the meet of a semilattice."