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| 2. |
- Ekstig, Kerstin, et al.
(author)
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Sonja Lyttkens
- 2015
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In: Upsala Nya Tidning. - : Upsala nya tidning. - 1104-0173. ; 125:12, s. B13-B13
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Journal article (pop. science, debate, etc.)abstract
- Sonja Lyttkens was born in 1919 and died in 2014. She was the second woman to get a PhD in mathematics in Sweden, and the first to become a university lecturer.
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| 3. |
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Esperantologio / Esperanto Studies
- 2015
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Editorial collection (peer-reviewed)abstract
- This issue contains five original studies, of which two are in Esperanto, two in English, and one in German. There is one review in Esperanto.
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| 4. |
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| 5. |
- Kiselman, Christer O., 1939-
(author)
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Analytic continuation of fundamental solutions to differential equations with constant coefficients
- 2011
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In: Annales de la Faculté des Sciences de Toulouse, Mathématiques. - Toulouse : Université Paul Sabatier. - 0240-2963. ; (6) 20:S2, s. 153-182
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Journal article (peer-reviewed)abstract
- If $P$ is a polynomial in ${\bf R}^n$ such that $1/P$ integrable, then the inverse Fourier transform of $1/P$ is a fundamental solution $E_P$ to the differential operator $P(D)$. The purpose of the article is to study the dependence of this fundamental solution on the polynomial $P$. For $n=1$ it is shown that $E_P$ can be analytically continued to a Riemann space over the set of all polynomials of the same degree as $P$. The singularities of this extension are studied.
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| 6. |
- Kiselman, Christer O., 1939-, et al.
(author)
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Bråk och språk – vad som är förnuftigt och logiskt
- 2017
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In: Nämnaren. - Göteborg : Nationellt centrum för matematikutbildning (NCM). - 0348-2723. ; :1, s. 45-49
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Journal article (other academic/artistic)abstract
- De termer och uttryck som används vid räkning med bråk kan för olika språk ha helt olika innebörder. Artikelförfattarna gör här en jämförelse mellan begreppen för några olika språk. Kan språkväxling vara till hjälp för lärande och förståelse?
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| 7. |
- Kiselman, Christer O., 1939-
(author)
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Characterizing digital straightness and digital convexity by means of difference operators
- 2011
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In: Mathematika. - London : University College of London. Department of Mathematics. - 0025-5793 .- 2041-7942. ; 57:2, s. 355-380
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Journal article (peer-reviewed)abstract
- We characterize straightness of digital curves in the integer plane by means of difference operators. Earlier definitions of digital rectilinear segments have used, respectively, Rosenfeld’s chord property, word combinatorics, Reveillès’ double Diophantine inequalities, and the author’s refined hyperplanes. We prove that all these definitions are equivalent. We also characterize convexity of integer-valued functions on the integers with the help of difference operators.
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| 8. |
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| 9. |
- Kiselman, Christer O., 1939-, et al.
(author)
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Convexity of marginal functions in the discrete case
- 2017
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In: Analysis Meets Geometry. - Cham : Birkhäuser Verlag. - 9783319524696 ; , s. 287-309
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Book chapter (peer-reviewed)abstract
- We define, using difference operators, classes of functions defined on the set of points with integer coordinates, which are preserved under the formation of marginal functions. The duality between classes of functions with certain convexity properties and families of second-order difference operators plays an important role and is explained using notions from mathematical morphology.
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| 10. |
- Kiselman, Christer O., 1939-, et al.
(author)
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Convexity of marginal functions in the discrete case
- 2010
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In: <em>Digital Geometry, Combinatorics, and Discrete Optimization</em>, published on 2010-12-15. PhD Thesis defended at Stockhom University on 2011-01-21.. - Stockholm : Stockholm University.
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Book chapter (other academic/artistic)
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