Envelope

mathematics

Oct 6, 2023 - 21:17
 0  8

envelope, in mathematics, a curve that is tangential to each one of a family of curves in a plane or, in three dimensions, a surface that is tangent to each one of a family of surfaces. For example, two parallel lines are the envelope of the family of circles of the same radius having centres on a straight line. An example of the envelope of a family of surfaces in space is the circular cone x2 − y2 = z2 as the envelope of the family of paraboloids x2 + y2 = 4a(z −  a).

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