My academic interests are logical calculi, proof theory, mathematical logic, complexity theory, cellular automata, combinatorics, and the philosophy of mathematics, but I am also interested in algorithmic art, graphics, and visualizations. My PhD thesis is about sequent calculi for first-order logics with free variables.

The focus of my research has been a method called *variable splitting*. This is a method applicable to free-variable tableaux, free-variable sequent calculi, connection methods, and matrix characterizations, that reduces redundancies in the search space by exploiting a relationship between branching formulas and universal formulas. Using contextual information to differentiate between occurrences of free variables, the method can be used to assigne different values to these occurrences in a consistent way. Read more in my PhD Thesis.

Annals of the New York Academy of Sciences [Show BibTeX code]

@article{PaulsonGroszAntonsen19, author = {Steve Paulson and Barbara J. Grosz and Roger Antonsen}, title = {Human cognition and the {AI} revolution}, journal = {Annals of the {N}ew {Y}ork {A}cademy of {S}ciences}, volume = 0, number = 0, keywords = {reality, human cognition, artificial intelligence, AI, computers, mathematics, Turing test, bias}, doi = {10.1111/nyas.14122}, url = {https://nyaspubs.onlinelibrary.wiley.com/doi/abs/10.1111/nyas.14122}, eprint = {https://nyaspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/nyas.14122}, abstract = {Discovering the true nature of reality may ultimately hinge on grasping the nature and essence of human understanding. What are the fundamental elements or building blocks of human cognition? And how will the rise of superintelligent machines challenge our ideas about cognition, reality, and the limits of human understanding? Logician/mathematician Roger Antonsen and computer science pioneer Barbara J. Grosz join forces to shed light on these questions and the horizon of artificial intelligence.}, }

Proceedings of Bridges 2018: Mathematics, Art, Music, Architecture, Education, Culture [Show BibTeX code]

@inproceedings{Antonsen18, author = {Roger Antonsen}, title = {Card Shuffling Visualizations}, pages = {451--454}, booktitle = {Proceedings of Bridges 2018: Mathematics, Art, Music, Architecture, Education, Culture}, year = {2018}, editor = {Eve Torrence, Bruce Torrence, Carlo S\'equin, and Krist\'of Fenyvesi}, isbn = {978-1-938664-27-4}, issn = {1099-6702}, publisher = {Tessellations Publishing}, address = {Phoenix, Arizona}, note = {Available online at \url{http://archive.bridgesmathart.org/2018/bridges2018-451.pdf}} }

Studia Logica, Stud Logica (2018) volume 106, issue 1, pages 215–218, Springer Netherlands, 2018. [Show BibTeX code]

@article{AntonsenNakkerud18, author = {Roger Antonsen and Andreas Nakkerud}, title = {Book Review: Jan von Plato, Elements of Logical Reasoning}, journal = {Studia Logica}, year = 2018, month = February, volume = 106, number = 1, pages = {215--218}, issn = {0039-3215}, url = {https://doi.org/10.1007/s11225-018-9783-y}, doi = {10.1007/s11225-018-9783-y}, publisher = {Springer Netherlands}, }

Journal of Symbolic Computation, volume 47, number 9, pages 1046–1065, Springer-Verlag, 2012. [Show BibTeX code]

@article{HansenAntonsenGieseWaaler12, author = {Christian Mahesh Hansen and Roger Antonsen Martin Giese and Arild Waaler}, title = {Incremental {V}ariable {S}plitting}, journal = {Journal of {S}ymbolic {C}omputation}, volume = 47, number = 9, pages = {1046–1065}, year = 2012, publisher = {Springer-Verlag}, ee = {http://dx.doi.org/10.1016/j.jsc.2011.12.032} }

PhD Thesis, Department of Informatics, University of Oslo, 2008. [Show BibTeX code]

@PhdThesis{Antonsen08, author = {Roger Antonsen}, title = {The {M}ethod of {V}ariable {S}plitting}, school = {University of Oslo}, year = 2008, key = {Automated Reasoning, Logic, Proof Theory, Connection Method, Tableau Calculus}, address = {Department of Informatics}, month = {June} }

In Nicola Olivetti and Camilla Schwind, editors, TABLEAUX '07, Automated Reasoning with Analytic Tableaux and Related Methods, Position Papers, LSIS.RR.2007.002, 2007. [Show BibTeX code]

@InProceedings{HansenAntonsenWaaler07, author = {Christian Mahesh Hansen and Roger Antonsen and Arild Waaler}, title = {Incremental {C}losure of {V}ariable {S}plitting {T}ableaux}, year = 2007, booktitle = {TABLEAUX '07, Automated Reasoning with Analytic Tableaux and Related Methods, Position Papers}, editor = {Nicola Olivetti and Camilla Schwind}, pages = {65–78}, publisher = {LSIS}, volume = {LSIS.RR.2007.002} }

In Frank Pfenning, editor, CADE-21, 21th International Conference on Automated Deduction, Bremen, Germany, volume 4603, pages 132–146, Lecture Notes in Computer Science, Springer-Verlag, 2007. [Show BibTeX code]

@InProceedings{AntonsenWaaler07b, author = {Roger Antonsen and Arild Waaler}, editor = {Frank Pfenning}, title = {A {L}abelled {S}ystem for {IPL} with {V}ariable {S}plitting}, booktitle = {CADE-21, 21th International Conference on Automated Deduction, Bremen, Germany}, volume = 4603, series = {Lecture Notes in Computer Science}, publisher = {Springer-Verlag}, year = {2007}, isbn = {978-3-540-73594-6}, pages = {132–146}, ee = {http://dx.doi.org/10.1007/978-3-540-73595-3_10} }

Journal of Automated Reasoning, volume 38(1–3), pages 3–30, 2007. [Show BibTeX code]

@ARTICLE{AntonsenWaaler07, author = {Roger Antonsen and Arild Waaler}, title = {Liberalized {V}ariable {S}plitting}, journal = {Journal of Automated Reasoning}, year = {2007}, number = {1–3}, volume = 38, ee = {http://dx.doi.org/10.1007/s10817-006-9055-9}, pages = {3–30} }

In Bernhard Beckert, editor, Automated Reasoning with Analytic Tableaux and Related Methods: 14th International Conference, TABLEAUX, Koblenz, Germany, volume 3702 of Lecture Notes in Computer Science, pages 33-47, Springer-Verlag, 2005. [Show BibTeX code]

@InProceedings{AntonsenWaaler05, author = {Roger Antonsen and Arild Waaler}, title = {Consistency of {V}ariable {S}plitting in {F}ree {V}ariable {S}ystems of {F}irst-{O}rder {L}ogic}, booktitle = {Automated Reasoning with Analytic Tableaux and Related Methods: 14th International Conference, TABLEAUX, Koblenz, Germany}, year = 2005, pages = {33–47}, series = {Lecture Notes in Computer Science}, editor = {Bernhard Beckert}, volume = 3702, isbn = {3-540-28931-3}, publisher = {Springer-Verlag}, ee = {http://dx.doi.org/10.1007/11554554_5} }

In Contributions to the Doctoral Programme of the Second International Joint Conference on Automated Reasoning (IJCAR 2004), Cork, Ireland, 04 July – 08 July, 2004, volume 106, pages 1–5, CEUR Workshop Proceedings, 2004. [Show BibTeX code]

@InProceedings{Antonsen04, author = {Roger Antonsen}, title = {Uniform {V}ariable {S}plitting}, year = 2004, booktitle = {Contributions to the Doctoral Programme of the Second International Joint Conference on Automated Reasoning (IJCAR 2004), Cork, Ireland, 04 July – 08 July, 2004}, volume = 106, publisher = CEUR Workshop Proceedings}, pages = {1–5}, issn = {1613–0073}, ee = {http://ceur-ws.org/Vol-106/01-antonsen.pdf} }

In Automated Reasoning with Analytic Tableaux and Related Methods: International Conference, TABLEAUX, Rome, Italy, Lecture Notes in Computer Science, volume 2796, pages 214–229, Springer-Verlag, 2003. [Show BibTeX code]

@InProceedings{WaalerAntonsen03, author = {Arild Waaler and Roger Antonsen}, title = {A {F}ree {V}ariable {S}equent {C}alculus with {U}niform {V}ariable {S}plitting}, booktitle = {Automated Reasoning with Analytic Tableaux and Related Methods: International Conference, TABLEAUX, Rome, Italy}, year = 2003, pages = {214–229}, series = {Lecture Notes in Computer Science}, number = 2796, publisher = {Springer-Verlag}, ee = {http://dx.doi.org/10.1007/978-3-540-45206-5_17} }

Master Thesis, Language, Logic and Information, Department of Linguistics, University of Oslo, 2003. [Show BibTeX code]

@mastersthesis{Antonsen03, author = {Roger Antonsen}, title = {Free {V}ariable {S}equent {C}alculi}, year = 2003, month = {May}, address = {Language, Logic and Information, Department of Linguistics}, school = {University of Oslo}, publisher = {University of Oslo} }

*Some research-related talks.*