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gr-qc2000
Fourth-Order Ricci Gravity
A. Borowiec, M. Francaviglia, V. I. Smirichinski
The Euler-Lagrange equations of motion for the most general Ricci type gravitational Lagrangians are derived by means of a purely metric formalism.
math.QA2000
Hopf modules and their duals
A. Borowiec, G. A. Vazquez Coutino
Free Hopf modules and bimodules over a bialgebra are studied with some details. In particular, we investigate a duality in the category of bimodules in this context. This gives the…