Eneva, Gergana On the special normal surfaces of the 5-dimensional projective space. (Russian. English, German summaries) Zbl 0606.51018 God. Sofij. Univ., Fak. Mat. Mekh. 74(1980), 7-9 (1986). Using the stereographic projection in 4-dimensional projective space of the special normal surface \(F^ 4_ 2\) of the 5-dimensional projective space \(P_ 5\), some results on the position of the elements of \(P_ 5\) with respect to \(F^ 4_ 2\) are obtained. A Cremona transformation of 4-th degree between two hyperplanes of \(P_ 5\) is obtained by the bisecants of \(F^ 4_ 2\). MSC: 51N15 Projective analytic geometry Keywords:five-dimensional projective space; stereographic projection; special normal surface; 5-dimensional projective space; Cremona transformation PDFBibTeX XMLCite \textit{G. Eneva}, God. Sofiĭ. Univ., Fak. Mat. Mekh. 74, 7--9 (1986; Zbl 0606.51018)