%0 Journal Article
%T Why all rings should have a 1
%A Bjorn Poonen
%J Mathematics
%D 2014
%I arXiv
%X We argue that the definition of ring should require the existence of a multiplicative identity 1 because this requirement is part of what associativity should be. We list counterarguments in order to rebut them.
%U http://arxiv.org/abs/1404.0135v1