Journal Article Normal developable surfaces of surfaces along curves

Hananoi, Satoshi  ,  Izumiya, Shyuichi

Description
We consider a developable surface normal to a surface along a curve on the surface. We call it a normal developable surface along the curve on the surface. We investigate the uniqueness and the singularities of such developable surfaces. We discover two new invariants of curves on a surface that characterize these singularities.
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https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/66937/1/2015075.pdf

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