Vogler, Hans; Wresnik, Helmut On a theorem of Frobenius in the \(n\)-dimensional isotropic space \(I^k_n\). (Über einen Satz von Frobenius im \(n\)-dimensionalen isotropen Raum \(I^k_n\).) (German) Zbl 1157.51014 Grazer Math. Ber. 352, 118-122 (2008). Reviewer: Hans-Peter Schröcker (Innsbruck) MSC: 51N25 53A17 53A35 PDFBibTeX XMLCite \textit{H. Vogler} and \textit{H. Wresnik}, Grazer Math. Ber. 352, 118--122 (2008; Zbl 1157.51014)
Wresnik, Helmut Motion with planar orbits in simply isotropic space. II. (Bewegungen mit ebenen Bahnen im einfach isotropen Raum. II.) (English) Zbl 1296.70009 Rad Hrvat. Akad. Znan. Umjet. 491, Mat. Znan. 15, 49-71 (2005). MSC: 70B15 PDFBibTeX XMLCite \textit{H. Wresnik}, Rad Hrvat. Akad. Znan. Umjet., Mat. Znan. 491(15), 49--71 (2005; Zbl 1296.70009)
Wresnik, Helmut Motion with planar orbits in simply isotropic space. I. (Bewegungen mit ebenen Bahnen im einfach isotropen Raum. I.) (English) Zbl 1296.70008 Rad Hrvat. Akad. Znan. Umjet. 491, Mat. Znan. 15, 23-47 (2005). MSC: 70B15 PDFBibTeX XMLCite \textit{H. Wresnik}, Rad Hrvat. Akad. Znan. Umjet., Mat. Znan. 491(15), 23--47 (2005; Zbl 1296.70008)
Wresnik, H. Isogonal cross ratio families on ruled surfaces. (Isogonale Doppelverhältnisscharen auf Regelflächen.) (German) Zbl 1089.53500 Anz., Abt. II, Österr. Akad. Wiss., Math.-Naturwiss. Kl. 135, 15-21 (1998). MSC: 53A05 PDFBibTeX XMLCite \textit{H. Wresnik}, Anz., Abt. II, Österr. Akad. Wiss., Math.-Naturwiss. Kl. 135, 15--21 (1998; Zbl 1089.53500)
Wresnik, Helmut Normal projections of vector systems in \(n\)-dimensional isotropic space \(I_n^k\). (Normalprojektionen von Vektorsystemen im \(n\)-dimensionalen isotropen Raum \(I_n^k\).) (German) Zbl 0924.51007 Grazer Math. Ber. 332, 33-42 (1997). Reviewer: Johannes Wallner (Wien) MSC: 51N25 PDFBibTeX XMLCite \textit{H. Wresnik}, Grazer Math. Ber. 332, 33--42 (1997; Zbl 0924.51007)
Wresnik, Helmut The Möbius transformations of \(n\)-dimensional isotropic space \(I_n^k\) of isotropy degree \(k\). (Die Möbiusabbildungen des \(n\)-dimensionalen isotropen Raumes \(I_n^k\) vom Isotropiegrad \(k\).) (German) Zbl 0907.53012 Grazer Math. Ber. 332, 3-14 (1997). Reviewer: H.Sachs (Leoben) MSC: 53A30 53A40 PDFBibTeX XMLCite \textit{H. Wresnik}, Grazer Math. Ber. 332, 3--14 (1997; Zbl 0907.53012)
Wresnik, Helmut Ruled surfaces in \(E_ n\) with a family of congruences of plane curves. I. (Die Regelflächen des \(E_ n\), die eine aus ebenen Kurven bestehende Kongruenzschar tragen. I.) (German) Zbl 0791.53005 Stud. Sci. Math. Hung. 27, No. 1-2, 133-142 (1992). MSC: 53A05 51N20 PDFBibTeX XMLCite \textit{H. Wresnik}, Stud. Sci. Math. Hung. 27, No. 1--2, 133--142 (1992; Zbl 0791.53005)
Wresnik, Helmut Ruled surfaces in \(E_ n\) with a family of congruences of plane curves. II. (Die Regelflächen des \(E_ n\), die eine aus ebenen Kurven bestehende Kongruenzschar tragen. II.) (German) Zbl 0791.53006 Stud. Sci. Math. Hung. 27, No. 3-4, 455-462 (1992). MSC: 53A05 51N20 PDFBibTeX XMLCite \textit{H. Wresnik}, Stud. Sci. Math. Hung. 27, No. 3--4, 455--462 (1992; Zbl 0791.53006)
Lang, Johann; Wresnik, Helmut Symmetric crushings at ray congruences in Euclidean space. (Symmetrische Schrotungen an Strahlkongruenzen des euklidischen Raumes.) (German) Zbl 0806.53010 Rad Hrvat. Akad. Znan. Umjet. 456, Mat. Znan. 10, 115-130 (1991). Reviewer: Georg Stamou (Thessaloniki) MSC: 53A17 53A25 PDFBibTeX XMLCite \textit{J. Lang} and \textit{H. Wresnik}, Rad Hrvat. Akad. Znan. Umjet., Mat. Znan. 456(10), 115--130 (1991; Zbl 0806.53010)
Wresnik, Helmut Ruled surfaces with several EK-families. II. (Regelflächen mit mehreren EK-Scharen. II.) (German) Zbl 0832.53011 Rad Hrvat. Akad. Znan. Umjet. 456, Mat. Znan. 10, 1-8 (1991). Reviewer: Georg Stamou (Thessaloniki) MSC: 53A25 PDFBibTeX XMLCite \textit{H. Wresnik}, Rad Hrvat. Akad. Znan. Umjet., Mat. Znan. 456(10), 1--8 (1991; Zbl 0832.53011)
Wresnik, Helmut Ruled surfaces with several EK-families. I. (Regelflächen mit mehreren EK-Scharen. I.) (German) Zbl 0791.53015 Rad, Jugosl. Akad. Znan. Umjet. 450, Mat. Znan. 9, 97-105 (1990). Reviewer: Hans Sachs (Leoben) MSC: 53A25 PDFBibTeX XMLCite \textit{H. Wresnik}, Rad, Jugosl. Akad. Znan. Umjet., Mat. Znan. 450(9), 97--105 (1990; Zbl 0791.53015)
Wresnik, Helmut Symmetrische Schrotungen an verallgemeinerten Regelflächen des \(E_ n\). (Symmetric motions with respect to generalized ruled surfaces in \(E_ n)\). (German) Zbl 0684.53014 J. Geom. 36, No. 1-2, 189-200 (1989). Reviewer: M.Husty MSC: 53A17 PDFBibTeX XMLCite \textit{H. Wresnik}, J. Geom. 36, No. 1--2, 189--200 (1989; Zbl 0684.53014) Full Text: DOI
Vogler, Hans; Wresnik, Helmut Endlichdimensionale isotrope Räume \(I^ n_ k\) vom Isotropiegrad k. (Finite-dimensional isotropic spaces having degree of isotropy k). (German) Zbl 0682.53012 Grazer Math. Ber. 307, 46 p. (1989). Reviewer: H.Sachs MSC: 53A17 53A40 51M99 PDFBibTeX XML
Wresnik, Helmut Pedal curves on \((k+1)\)-ruled surfaces. (Fußpunktkurven auf \((k+1)\)-Regelflächen.) (German) Zbl 0678.53007 Geom. Dedicata 31, No. 2, 125-136 (1989). Reviewer: Oswald Giering (München) MSC: 53A07 53A25 PDFBibTeX XMLCite \textit{H. Wresnik}, Geom. Dedicata 31, No. 2, 125--136 (1989; Zbl 0678.53007) Full Text: DOI
Wresnik, Helmut Bögen der kinematischen Ordnung 2 in der isotropen Ebene. (Arcs of kinematical order 2 in the isotropic plane). (German) Zbl 0676.53016 J. Geom. 35, No. 1-2, 186-192 (1989). Reviewer: H.Sachs MSC: 53A35 53A40 PDFBibTeX XMLCite \textit{H. Wresnik}, J. Geom. 35, No. 1--2, 186--192 (1989; Zbl 0676.53016) Full Text: DOI
Wresnik, Helmut Regelflächen mit einem Büschel ebener Fußpunktkurven, welche die Erzeugenden nach kongruenten Punktreihen schneiden. (Ruled surfaces with planar pedal curves intersecting the generators in congruent point sequences). (German) Zbl 0669.53004 Sitzungsber., Abt. II, Österr. Akad. Wiss., Math.-Naturwiss. Kl. 197, No. 1-3, 190-196 (1988). Reviewer: H.Brauner MSC: 53A05 53A25 PDFBibTeX XMLCite \textit{H. Wresnik}, Sitzungsber., Abt. II, Österr. Akad. Wiss., Math.-Naturwiss. Kl. 197, No. 1--3, 190--196 (1988; Zbl 0669.53004)
Wresnik, Helmut Die Regelflächen des \(E_ n\), die eine aus ebenen Kurven bestehende Kongruenzschar tragen. II. (Ruled surfaces in \(E_ n\) with a family of congruences of plane curves. II). (German) Zbl 0639.51021 Stud. Sci. Math. Hung. (to appear). Reviewer: H.Wresnik MSC: 51N20 53A05 PDFBibTeX XML
Wresnik, Helmut Die Regelflächen des \(E_ n\), die eine aus ebenen Kurven bestehende Kongruenzschar tragen. I. (Ruled surfaces in \(E_ n\) with a family of congruences of plane curves. I). (German) Zbl 0639.51020 Stud. Sci. Math. Hung. (to appear). Reviewer: H.Wresnik MSC: 51N20 53A05 PDFBibTeX XML