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We study the Zariski closures of orbits of representations of quivers of type , ou
. With the help of Lusztig’s canonical base, we characterize the rationally smooth
orbit closures and prove in particular that orbit closures are smooth if and only if they
are rationally smooth.
The Dynkin and the extended Dynkin graphs are characterized by representations over the real numbers.
Over the past few years there has been considerable progress in the structural understanding of special Colombeau algebras. We present some of the main trends in this development: non-smooth differential geometry, locally convex theory of modules over the ring of generalized numbers, and algebraic aspects of Colombeau theory. Some open problems are given and directions of further research are outlined.
In this article, we survey recent work on the construction and geometry of representations of a quiver in the category of coherent sheaves on a projective algebraic manifold. We will also prove new results in the case of the quiver • ← • → •.
Let A be a noetherian local commutative ring and let M be a suitable complex of A-modules. It is proved that M is a dualizing complex for A if and only if the trivial extension A ⋉ M is a Gorenstein differential graded algebra. As a corollary, A has a dualizing complex if and only if it is a quotient of a Gorenstein local differential graded algebra.
Let be a dg--module, the endomorphism dg-algebra of . We know that if is a good silting object, then there exist a dg-algebra and a recollement among the derived categories of , of and of . We investigate the condition under which the induced dg-algebra is weak nonpositive. In order to deal with both silting and cosilting dg-modules consistently, the notion of weak silting dg-modules is introduced. Thus, similar results for good cosilting dg-modules are obtained. Finally, some...
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