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A hyphen is not a problem either: Batalin-Vilkovisky algebra. The problem with the original URL is that it is not a hyphen but an en-dash, which is not an ASCII character and therefore needs to be percent-encoded (as %E2%80%93): Batalin–Vilkovisky algebra.
As time passes, there are fewer and fewer "old timers" who know what ASCII is, and thus more and more people who name their web pages in non-ASCII ways, leading to questions like this.
@Kevin: My word processor on its own is likely to change quotation marks and hyphens to non-ASCII things (unless I have done some incantation to prevent that).