A Note on the Envelope of a Certain Family of Curves

Pars, L. A.

doi:10.1112/jlms/s1-22.1.25

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2020

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“…For more information about these and additional definitions, see [2,4,17,29]. For a variety of envelope applications and related results, see [3,8,16,21,26,28] and the references therein.…”

Section: Introductionmentioning

confidence: 99%

Applications of envelopes

Bickel

Gorkin

Tran

2020

Complex Anal Synerg

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Intuitively, an envelope of a family of curves is a curve that is tangent to a member of the family at each point. Here we use envelopes of families of circles to study objects from matrix theory and hyperbolic geometry. First we explore relationships between numerical ranges of 2 × 2 matrices and families of circles to study the elliptical range theorem. Then we deduce a relationship between envelopes and the boundaries of families of intersecting circles and use it to find the boundaries of various families of pseudohyperbolic disks.

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“…For more information about these and additional definitions, see [2,4,17,29]. For a variety of envelope applications and related results, see [3,8,16,21,26,28] and the references therein.…”

Section: Introductionmentioning

confidence: 99%