Bayram, Bengü KılıçÖztürk, Günay2022-05-122022-05-122012Bulca, B. vd. (2012). "Spherical product surfaces in e-4". Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica, 20(1), 41-54.1224-17841844-0835https://doi.org/10.2478/v10309-012-0004-9https://sciendo.com/article/10.2478/v10309-012-0004-9http://hdl.handle.net/11452/26423In the present study we calculate the coefficients of the second fundamental form and curvature ellipse of spherical product surfaces in E-4. Otsuki rotational surfaces and Ganchev-Milousheva rotational surfaces are the special type of spherical product surfaces in E-4. Further, we give necessary and sufficient condition for the origin of NpM to lie on the curvature ellipse of such surfaces. Finally we get the necessary condition for Ganchev-Milousheva rotational surfaces in E-4 to become flat or Chen type. We also give some examples of the projections of these surfaces in E-3.eninfo:eu-repo/semantics/openAccessMathematicsSecond fundamental formCurvature ellipseSpherical productOtsuiki surfaceArticle0003044687000042-s2.0-848619476614154201Mathematics, appliedMathematicsGauss Map; Second Fundamental Form; Ruled Surface