Research output per year
Research output per year
Personal profile
Profile
Ph.D. 1993 Dr.scient 2002
Research interests: Harmonic analysis, frame expansions, wavelets, Gabor systems
Other information
Visiting researcher at Georgia Institute of Technology (1997), University of Missouri (1998), University of Vienna (2002). Guest professor at University of San Luis, Argentina, 3 months in 1999, 2000, 2004. Held Ph.D. courses in Argentina, Germany, and South Korea. Extensive collaborations with KAIST in Korea and NUS in Singapore.
Research areas
Functional analysis
Wavelet analysis
Series expansions in Hilbert spaces
Education/Academic qualification
Ph.D., University of Aarhus, University of Vienna
1991 → 1993
Ph.D., University of Aarhus, University of Vienna
1991 → 1993
Master of Science, University of Aarhus
1985 → 1990
Master of Science, University of Aarhus
1985 → 1990
Keywords
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Approximate frame representations via iterated operator systems
Christensen, O. & Hasannasab, M., 2022, (Accepted/In press) In: Studia Mathematica. 19 p.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile157 Downloads (Pure) -
Approximately dual pairs of wavelet frames
Benavente, A., Christensen, O., Hasannasab, M., Kim, H. O., Kim, R. Y. & Kovac, F. D., 2022, In: Journal of Mathematical Analysis and Applications. 507, 2, 16 p., 125841.Research output: Contribution to journal › Journal article › Research › peer-review
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Completion versus removal of redundancy by perturbation
Christensen, O. & Hasannasab, M., 2021, In: Canadian Mathematical Bulletin. 14 p.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile23 Downloads (Pure) -
Explicit construction of frames and pairs of dual frames on locally compact abelian groups
Christensen, O. & Goh, S. S., 2021, In: Sampling Theory, Signal Processing, and Data Analysis. 19, 26 p., 4.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile13 Downloads (Pure) -
On Approximate Operator Representations of Sequences in Banach Spaces
Christensen, O., Hasannasab, M. & Steidl, G., 2021, In: Complex Analysis and Operator Theory. 15, 3, 23 p., 54.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile16 Downloads (Pure)
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European Consortium for Mathematics in Industry (ECMI)
Sørensen, M. P., Poulsen, N. K., Brøns, M., Hjorth, P. G., Skovgaard, O. & Christensen, O.
01/01/1991 → …
Project: Research
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The frame set for Gabor systems generated by B-splines
Nielsen, K. H., Lemvig, J., Christensen, O., Knudsen, K., Romero, J. L. & Nielsen, M.
Technical University of Denmark
01/08/2016 → 11/12/2019
Project: PhD
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Mathematic and Efficient Signal Representation
Hasannasabjaldehbakhani, M., Christensen, O., Lemvig, J., Knudsen, K., Grosse-Erdmann, K. & Nielsen, M.
01/12/2015 → 12/12/2018
Project: PhD