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math.DG2023
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…
math.DG2023
Envelopes created by circle families in the plane
Yongqiao Wang, Takashi Nishimura
In this paper, on envelopes created by circle families in the plane, all four basic problems (existence problem, representation problem, problem on the number of envelopes, problem…