The Steenrod Algebra and Other Copolynomial Hopf Algebras

Abstract

We say that a Hopf algebra is copolynomial if its dual is polynomial as an algebra. We re-derive Milnor's result that the mod 2 Steenrod algebra is copolynomial by means of a more general result that is also applicable to a number of other related Hopf algebras. 1991 Mathematics Subject Classification 55S10, 16W30.