Missing: Fingerprints

I've just been looking at wooden keyboards. They're very attractive, but the ones with wooden keys cost thou$and$. I have a semi-morbid curiosity about how long my keyboard can last. I'll let you imagine how disgusting this thing looks. I've had it since 1998, at least. It's seen beer, beard, bread, and surely things are breeding in there. Perhaps it's doing my immune system a service.

So, it turns out that Kokorin and Kopytov's translated proof of stuff about formal power series in the context of ordered groups is much less readable than B.H.Neumann's version. I feel like a doofus for not reading Neumann's sooner, especially since K&K cite it. I am so ex. Cite it.