Friday, 20 January 2012

qa.quantum algebra - Coaction on the Universal Calculus

Let A be an algebra, H a Hopf algebra, and
betaA:AtoAotimesH,     amapstoa(1)otimesa(2)


a right H-coaction. This induces a right H-coaction on AotimesA defined by
betaAotimesA:aotimesbmapstoa(1)otimesb(1)otimesa(2)b(2).

My question is: Does this restrict to a coaction on the universal calculus over A, namely to a H-coaction on the kernel of the multiplication map m:AotimesAtoA? I feel this is a very simple question but I can't seem to find an answer.



If the construction does not work, does anyone know of a way to induce a coaction on the universal calculus over A from betaA?

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