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math.DG2005
Singularities of improper affine spheres and surfaces of constant Gaussian curvature
Go-o Ishikawa, Yoshinori Machida
We study the equation for improper (parabolic) affine spheres from the view point of contact geometry and provide the generic classification of singularities appearing in geometric…
math.DG2003★ 1 cited
Infinitesimal deformations and stabilities of singular Legendre submanifolds
G. Ishikawa
We give the characterization of Arnol'd-Mather type for stable singular Legendre immersions. The most important building block of the theory is providing a module structure on the…