Abstract
Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsBettina RichmondBETTINA RICHMOND received her Ph.D. from Florida State University under the direction of Warren Nichols in 1985. Her primary research interests are Hopf algebras and semigroups. This is her third article in this Monthly.Tom RichmondTOM RICHMOND received his Ph.D. from Washington State University under the direction of Darrell Kent in 1986. His research interests lie at the intersection of topology and order. He recently completed a 4-year stint as Chair-Elect and Chair of the Kentucky Section of the MAA.
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