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researcher

T. Helgaker

29 papers hereh-index 8231k citations399 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • first author1
  • middle author9
  • last author19

Across the 29 of 29 papers where every author was matched, so the position is known.

fields
  • physics.chem-ph26
  • cond-mat.mtrl-sci2
  • math-ph1

identity via Semantic Scholar / OpenAlex

activity
20122025
most citedCoupled-cluster theory for atoms and molecules in strong magnetic fields

90 citations · 568 across the 29 of their papers we have counts for

collaborators
Showing 2013Show all

3 papers · 1 filter

physics.chem-ph2013★ 62 cited

Differentiable but exact formulation of density-functional theory

Simen Kvaal, Ulf Ekström, Andrew M. Teale +1

The universal density functional F of density-functional theory is a complicated and ill-behaved function of the density-in particular, F is not differentiable, making many for…

math-ph2013★ 23 cited

Fermion N-representability for prescribed density and paramagnetic current density

Erik Tellgren, Simen Kvaal, Trygve Helgaker

The N-representability problem is the problem of determining whether or not there exists N-particle states with some prescribed property. Here we report an affirmative solution…

physics.chem-ph2013★ 42 cited

Alternative separation of exchange and correlation energies in multi-configuration range-separated density-functional theory

Alexandrina Stoyanova, Andrew M. Teale, Julien Toulouse +2

The alternative separation of exchange and correlation energies proposed by Toulouse et al. [Theor. Chem. Acc. 114, 305 (2005)] is explored in the context of multi-configuration ra…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.