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Precise classification theorems are therefore stated for equivariant extensions by groups either of monoids, or groups, or rings, or rings-groups or algebras as well as for graded
All objects we study in this note are modules over a commutative ring R of which we make one further assumption: that the complete ring of quotients of R be R -injective (for which
If in addition G is torsion free, the results of Brumer, Neumann and others show that Ω G and Λ G have finite global dimen-.. sion and have no zero-divisors; for an overview,
We will give now some sufficient conditions for the convolution’s existence. If one of the following conditions are true, the currents’ convolution always exists:.. a) G is compact;
Earlier the problem of Krull dimension was investigated only for some particular cases, namely, for Weyl algebras [2], a ring of differ- ential operators [7,8], as well as for rings
We believe that geometric invariants for metrics in the moduli spaces Riem(G, ξ) (as curvature or geodesics) may provide insights for new classifications of Lie
sample points for each year, the global shape of an estimated density cannot be very close to the true density at all points, but if the duration density is a smooth
More precisely, if we fit a different one-factor model to each day’s data, we get an average error of 2–3 basis points for each fitted yield, but if we demand that the model
