4 citations
4 papers
Implicit infinite lattice summations for real space ab initio correlation methods
Martin Albrecht
We suggest a local wave function based ab initio correlation method for infinite periodic systems, which can describe both the near range as well as the long range correlation effe…
Towards a frequency independent incremental ab initio scheme for the self energy
Martin Albrecht
The frequency dependence of the self energy of a general many--body problem is identified as a main obstacle in correlation calculations based on local approaches. A frequency inde…
Linking and coincidence invariants
Ulrich Koschorke
Given a link map f into a manifold of the form Q = N \times \Bbb R, when can it be deformed to an unlinked position (in some sense, e.g. where its components map to disjoint \Bbb R…
Nielsen coincidence theory in arbitrary codimensions
Ulrich Koschorke
Given two maps f_1, f_2 : M^m \longrightarrow N^n between manifolds of the indicated arbitrary dimensions, when can they be deformed away from one another? More generally: what is…