. . "MATHEMATICS Geometry Differential." . . . . . . . . . . . "Intrinsic geometry of convex surfaces" . "Intrinsic geometry of convex surfaces"@en . . . . . . "Electronic books"@en . . . . . . . . . . "MATHEMATICS Reference." . . "Electronic books." . . "MATHEMATICS Essays." . . "MATHEMATICS Pre-Calculus." . .