dual curve
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Dual curve — Curves, dual to each other; see below for properties. In projective geometry, a dual curve of a given plane curve C is a curve in the dual projective plane consisting of the set of lines tangent to C. There is a map from a curve to its dual,… … Wikipedia
Dual polygon — In geometry, polygons are associated into pairs called duals, where the vertices of one correspond to the edges of the other. Contents 1 Properties 2 Kinds of duality 2.1 Rectification … Wikipedia
Dual front — is a design concept which allows a device to have two distinctive sides, one for each function. It is most commonly used in camera phones. Advantages The main advantage of using a dual fronted device is the enhanced ease of use by having… … Wikipedia
Dual EC DRBG — is a controversial pseudorandom number generator (PRNG) designed and published by the National Security Agency. It is based on the elliptic curve discrete logarithm problem (ECDLP) and is one of the four PRNGs standardized in the NIST Special… … Wikipedia
Dual abelian variety — In mathematics, a dual abelian variety can be defined from an abelian variety A, defined over a field K. Contents 1 Definition 2 History 3 Dual isogeny (elliptic curve case) … Wikipedia
Trott curve — In real algebraic geometry, the Trott curve is the set of points ( x , y ) satisfying the degree four polynomial equation:displaystyle 144(x^4+y^4) 225(x^2+y^2)+350x^2y^2+81=0.These points form a nonsingular quartic plane curve that has genus… … Wikipedia
Ampersand curve — In mathematics, the ampersand curve is a quartic plane curve given by the equation:: (y^2 x^2)(x 1)(2x 3)=4(x^2+y^2 2x)^2.It is an algebraic curve of genus zero, with three ordinary double points, all in the real plane. By the Plücker formulas,… … Wikipedia
Pedal curve — Geometric construction of the pedal of C with respect to P In the differential geometry of curves, a pedal curve is a curve derived by construction from a given curve (as is, for example, the involute). Let C be a given curve and P a fixed point… … Wikipedia
Plane curve — In mathematics, a plane curve is a curve in a Euclidean plane (cf. space curve). The most frequently studied cases are smooth plane curves (including piecewise smooth plane curves), and algebraic plane curves. A smooth plane curve is a curve in a … Wikipedia
Parallel curve — An ellipse (red), its evolute (blue) and some parallel curves (green). Note how the parallel curves have cusps when they touch the evolute … Wikipedia
Negative pedal curve — Circle negative pedal curve of a limaçon In the plane, for every point X other than P there is a unique line through X perpendicular to XP. For a given curve in the plane and a given fixed point P, called the pedal point, the negative pedal curve … Wikipedia
