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The Hopf map written as : is an example of a pairing. For instance, Hardie et al. [ 1 ] present an explicit construction of the map using poset models. Pairings in cryptography
A basic example in topology is lifting a path in one topological space to a path in a covering space. [1] For example, consider mapping opposite points on a sphere to the same point, a continuous map from the sphere covering the projective plane. A path in the projective plane is a continuous map from the unit interval [0,1]. We can lift such a ...
Analytic geometry associates to each point in the Euclidean plane an ordered pair. The red ellipse is associated with the set of all pairs ( x , y ) such that x 2 / 4 + y 2 = 1 . In mathematics , an ordered pair , denoted ( a , b ), is a pair of objects in which their order is significant.
The function is called the conformal factor. A diffeomorphism between two Riemannian manifolds is called a conformal map if the pulled back metric is conformally equivalent to the original one. For example, stereographic projection of a sphere onto the plane augmented with a point at infinity is a conformal map.
A rectangular grid (top) and its image under a conformal map f (bottom). It is seen that f maps pairs of lines intersecting at 90° to pairs of curves still intersecting at 90°. A conformal map is a function which preserves angles locally. In the most common case the function has a domain and range in the complex plane. More formally, a map,
In fact, this map is exactly the induced map on homology groups, but it descends to the quotient. Let ( X , A ) {\displaystyle (X,A)} and ( Y , B ) {\displaystyle (Y,B)} be pairs of spaces such that A ⊆ X {\displaystyle A\subseteq X} and B ⊆ Y {\displaystyle B\subseteq Y} , and let f : X → Y {\displaystyle f\colon X\to Y} be a continuous map.
For example, using a compass, straightedge, and a piece of paper on which we have the parabola y=x 2 together with the points (0,0) and (1,0), one can construct any complex number that has a solid construction. Likewise, a tool that can draw any ellipse with already constructed foci and major axis (think two pins and a piece of string) is just ...
The closest pair of points problem or closest pair problem is a problem of computational geometry: given points in metric space, find a pair of points with the smallest distance between them. The closest pair problem for points in the Euclidean plane [ 1 ] was among the first geometric problems that were treated at the origins of the systematic ...