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math.RA1999
Cotensor products of modules
Lowell Abrams, Charles Weibel
Let C be a coalgebra over a field k and A its dual algebra. The category of C-comodules is equivalent to a category of A-modules. We use this to interpret the cotensor product M \s…
math.RA1998
Modules, comodules and cotensor products over Frobenius algebras
Lowell Abrams
We characterize noncommutative Frobenius algebras A in terms of the existence of a coproduct which is a map of left A^e-modules. We show that the category of right (left) comodules…