On Surfaces with a Rectilinear Geodesic Circle |
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angle arcsin arctan boundary conditions computation conjugate construction coordinate axis cos2s course curves A(v curves C(u defined determined developable surface differential equation Doctor of Philosophy dv² envelopes of families equation II-29a equation II-56 fact families of cones Figure Frenet equations function g(u fundamental form Gaussian curvature geodesic curvature gives hence identically intersection isometric length meridian obtained as envelopes one-parameter family orthogonal osculating plane parameter parametric equation partial differential equation plane sheet point F principal normal Q and Q rectangle R(0 rectifying developable rectilinear geodesic circle Section segment sin² sin²t solutions surface of revolution surface S(A system I-13 system II-29 tangent theorem Theorema Egregium tion triangle FAB vanishes vector versor z-axis ι 1 ι аф аф