envelope of tangents

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• Envelope — En vel*ope (?; 277), Envelop En*vel op (?; 277), n. [F. enveloppe.] 1. That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. [1913 Webster] 2. (Astron.) The… …   The Collaborative International Dictionary of English

• Envelope (mathematics) — In mathematics, an envelope of a family of manifolds (especially a family of curves) is a manifold that is tangent to each member of the family at some point.Envelope of a family of curvesThe simplest formal expression for an envelope of curves… …   Wikipedia

• push the envelope — Envelope En vel*ope (?; 277), Envelop En*vel op (?; 277), n. [F. enveloppe.] 1. That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. [1913 Webster] 2.… …   The Collaborative International Dictionary of English

• coma — Envelope En vel*ope (?; 277), Envelop En*vel op (?; 277), n. [F. enveloppe.] 1. That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. [1913 Webster] 2.… …   The Collaborative International Dictionary of English

• Envelop — Envelope En vel*ope (?; 277), Envelop En*vel op (?; 277), n. [F. enveloppe.] 1. That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. [1913 Webster] 2.… …   The Collaborative International Dictionary of English

• Hyperbola — This article is about a geometrical curve, a conic section. For the term used in rhetoric, see Hyperbole …   Wikipedia

• Parabola — For other uses, see Parabola (disambiguation). A parabola …   Wikipedia

• Legendre transformation — f(x) . The function is shown in red, and the tangent line at point (x 0, f(x 0)) is shown in blue. The tangent line intersects the vertical axis at (0, f^star) and f^star is the value of the Legendre transform f^star(p 0) , where p 0=dot{f}(x 0) …   Wikipedia

• Mark Twain — Mark Twain, photo by A. F. Bradley New York, 1907 Born …   Wikipedia

• Keytar — A keytar is a relatively lightweight keyboard or synthesizer that is supported by a strap around the neck and shoulders, similar to the way a guitar is supported by a guitar strap. Keytars allow players a greater range of movement compared to… …   Wikipedia

• Roulette (curve) — [ |right|thumb|250px|Construction of a roulette: specifically, a cissoid of Diocles.] In the differential geometry of curves, a roulette is a kind of curve, generalizing cycloids, epicycloids, hypocycloids, and involutes. Roughly speaking, it is… …   Wikipedia