Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Helmut Mäurer"'
Publikováno v:
Research in Globalization, Vol 6, Iss , Pp 100106- (2023)
In this paper a two-phase pandemic-economic model is proposed, with phase-specific modeling and policy variables – as suggested by the chronicle of pandemic and economic policy developments over the period 2020–2021. In a first phase, the spread
Externí odkaz:
https://doaj.org/article/c9f6de74316d42ef9032e62058b69fc8
Autor:
Helmut Mäurer
Publikováno v:
Journal of Geometry. 86:150-153
An involutory automorphism of an inversive plane whose set of fixed points consists of exactly two points resp. of a circle is called a harmonic involution resp. an inversion. In this paper we study inversive planes with sufficiently many such involu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::202801cb7f925c54467d6ce655804c77
https://doi.org/10.1007/s00022-006-1912-5
https://doi.org/10.1007/s00022-006-1912-5
Autor:
Helmut Mäurer
Publikováno v:
advg. 5:657-661
An involutory automorphism of an inversive plane with exactly two fixed points is called an harmonic involution. In this paper we study inversive planes with sufficiently many harmonic involutions satisfying an analog of the theorem about the three r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afcdca7df9de7986693682570ae0033d
https://doi.org/10.1515/advg.2005.5.4.657
https://doi.org/10.1515/advg.2005.5.4.657
Autor:
Helmut Mäurer
Publikováno v:
Monatshefte für Mathematik. 128:7-21
A bijection \(\) of the compact convex set \(\) with \(\) is called a reflection of K, if σ maps convex subsets of K into convex subsets. Conditions are stated unter which the existence of few reflections imply that \(\) is an ellipse.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68fb77f12a0862082218795a27efd113
https://doi.org/10.1007/pl00010084
https://doi.org/10.1007/pl00010084
Autor:
Helmut Mäurer
Publikováno v:
Mathematische Semesterberichte. 46:93-96
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9dcf77e7630dbac5b18e3876f25ca82e
https://doi.org/10.1007/s005910050055
https://doi.org/10.1007/s005910050055
Autor:
Helmut Mäurer, Markus Stroppel
Publikováno v:
Geometriae Dedicata. 68:229-243
We classify those groups whose automorphism group has at most three orbits. In other words, we classify those groups whose holomorph is a rank 3 permutation group.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66f561af1bb83e42a50a1a4032442019
https://doi.org/10.1023/a:1005090519480
https://doi.org/10.1023/a:1005090519480
Autor:
Helmut Mäurer
Publikováno v:
Geometriae Dedicata. 58:15-20
Collineations τ1, τ2 of PG(2, ℝ) leaving invariant a compact convex setK\( \subseteq\) ℝ2 are called parabolic if |∂K ∩ Fix τi|=1. Conditions are stated under which the existence of τ1, τ2 imply that ∂K is an ellipse.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed40084367bb597e0af543adbb93ced9
https://doi.org/10.1007/bf01263472
https://doi.org/10.1007/bf01263472
Autor:
Helmut Mäurer
Publikováno v:
Results in Mathematics. 19:335-340
Let (ℝ2,ℝ[x]) denote the incidence structure consisting of the point set ℝ2 and the set {{(x, f(x)) ¦ x ∈ ℝ} ¦ f ∈ ℝ[x]} of blocks. It will be shown, that every automorphism of this geometry has the form (x, y) ↦ (ax + b, cy + d(x))
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76a4c6cd74f611a8ec61e70d056b578b
https://doi.org/10.1007/bf03323291
https://doi.org/10.1007/bf03323291
Autor:
Helmut Mäurer
Publikováno v:
Geometriae Dedicata. 38
The inversive planes over a Euclidean field are characterized by properties of the group generated by the harmonic involutions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c37339e7989e766597253e6d871252a7
https://doi.org/10.1007/bf00181189
https://doi.org/10.1007/bf00181189
Autor:
Helmut Mäurer
Publikováno v:
Geometriae Dedicata. 36
This paper gives a characterization of the permutation group PSL(2, K) over a quadratic closed field of characteristic ≠2.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f46fc0630ede52e13d1f3219d6476ed5
https://doi.org/10.1007/bf00150791
https://doi.org/10.1007/bf00150791