cancellation ringCancellationRing2001-10-20 14:43:202002-07-25 19:35:28Definition\usepackage{amssymb}
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\usepackage{xypic}A ring $R$ is a {\em cancellation ring} if for all $a,b \in R$, if $a \cdot b = 0$ then either $a=0$ or $b=0$.