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== Changes ==
I've made some changes to the article. The introduction was not general enough. I made it general and simple. The old introduction made only passing reference to more complicated objects such as Dirichlet convalutions. For that reason I removed a lot of it. It was difficult to add more detail later without repeating oneself. That problem's gone now. Please feel free to add new sections. [[User:Declan Davis#top|<span style="background-color:green;color:gold;"> <i><b>Declan Davis</b></i> </span>]] [[User talk:Declan Davis#top|<span style="background-color:green;color:gold;"> <i><b>(talk)</b></i> </span>]] 20:58, 1 October 2008 (UTC)
