This column is a forum for discussion of mathematical communities thro
ughout the world, and through all time. Our definition of ''mathematic
al community'' is the broadest. We include ''schools'' of mathematics,
circles of correspondence, mathematical societies, student organizati
ons, and informal communities of cardinality greater than one. What we
say about the communities is just as unrestricted. We welcome contrib
utions from mathematicians of all kinds and in all places, and also fr
om scientists, historians, anthropologists, and others.