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math.DG2024
A characterization of the Legendre involution on the class of generic frontals
Takashi Nishimura
We show that, under an additional mild assumption, on the class of generic frontals, any involution whose fixed point set is exactly the same as the fixed point set of the Legendre…
math.DG2024
Envelopes of straight line families in the plane
Takashi Nishimura
There is a widespread method to represent the envelope when a given hyperplane family creates an envelope. However, one sometimes encounters cases when the widespread method fails…