cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

User: Eva Kalinowski

Eva Kalinowski's wiki page.

Eva Kalinowski has authored 3 sequences.

A225823 Number of hopping sequences in four-colored rooted trees with n nodes, starting and ending with the same "initial state" from all of the (two-colored) rooted trees in A198760. Compared to A198761, only one node color of the initial states is mobile on the tree (Falicov-Kimball model).

Original entry on oeis.org

1, 4, 54, 1568, 80680, 6510624, 761286848, 121944722176, 25668462562560
Offset: 2

Author

Eva Kalinowski, Jul 30 2013

Keywords

References

  • G. Gruber, Entwicklung einer graphbasierten Methode zur Analyse von Hüpfsequenzen auf Butcherbäumen und deren Implementierung in Haskell, Diploma thesis, Marburg, 2011
  • M. Paech, E. Kalinowski, W. Apel, G. Gruber, R. Loogen, and E. Jeckelmann, Ground-state energy and beyond: High-accuracy results for the Hubbard model on the Bethe lattice in the strong-coupling limit, DPG Spring Meeting, Berlin, TT 45.91 (2012)

Crossrefs

Extensions

Term a(10) added by Martin Paech, Sep 02 2013, calculated on a HP Integrity Superdome 2-32s by courtesy of Hewlett-Packard Development Company, L.P.

A226585 Denominators of the series expansion of the ground-state energy of the Hubbard model in the limits of strong coupling and infinite dimensions.

Original entry on oeis.org

2, 2, 8, 32, 128, 2048, 55296, 31850496
Offset: 2

Author

Eva Kalinowski, Jun 12 2013

Keywords

Comments

a(n) is the denominator of the sum of the weighted contributions from the A198761(n) ways of electron hopping on all of the A198760(n) initial spin-configurations, see eq. A1 in Phys. Rev. B 85, 045105 (2012).

Examples

			-1/2, -1/2, -19/8, -593/32, -23877/128, -4496245/2048, ... = A226584/A226585
		

References

  • Eva Kalinowski, Mott-Hubbard-Isolator in hoher Dimension, Dissertation, Marburg: Fachbereich Physik der Philipps-Universität, 2002.
  • M. Paech, E. Kalinowski, W. Apel, G. Gruber, R. Loogen, and E. Jeckelmann, Ground-state energy and beyond: High-accuracy results for the Hubbard model on the Bethe lattice in the strong-coupling limit, DPG Spring Meeting, Berlin, TT 45.91 (2012).

Crossrefs

Cf. A226584.

A226584 Numerators of the series expansion of the ground-state energy of the Hubbard model in the limits of strong coupling and infinite dimensions.

Original entry on oeis.org

-1, -1, -19, -593, -23877, -4496245, -1588528613, -12927125815211
Offset: 2

Author

Eva Kalinowski, Jun 12 2013

Keywords

Comments

a(n) is the numerator of the sum of the weighted contributions from the A198761(n) ways of electron hopping on all of the A198760(n) initial spin-configurations, see eq. A1 in Phys. Rev. B 85, 045105 (2012).

Examples

			-1/2, -1/2, -19/8, -593/32, -23877/128, -4496245/2048, ... = A226584/A226585
		

References

  • Eva Kalinowski, Mott-Hubbard-Isolator in hoher Dimension, Dissertation, Marburg: Fachbereich Physik der Philipps-Universität, 2002.
  • M. Paech, E. Kalinowski, W. Apel, G. Gruber, R. Loogen, and E. Jeckelmann, Ground-state energy and beyond: High-accuracy results for the Hubbard model on the Bethe lattice in the strong-coupling limit, DPG Spring Meeting, Berlin, TT 45.91 (2012).

Crossrefs

Cf. A226585.