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Topic: Cotangent space


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 Cotangent space -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-05)
All cotangent spaces have the same (The magnitude of something in a particular direction (especially length or width or height)) dimension, equal to the dimension of the manifold.
For this reason it is important to maintain the distinction between the tangent space and the cotangent space.
All the cotangent spaces of a manifold can be "glued together" to form a new differentiable manifold of twice the dimension, the (Click link for more info and facts about cotangent bundle) cotangent bundle of the manifold.
www.absoluteastronomy.com /encyclopedia/c/co/cotangent_space.htm   (1055 words)

  
 Tangent space - Wikipedia, the free encyclopedia
The tangent space of a manifold is a concept which needs to be introduced when generalizing vectors from affine spaces to general manifolds, since in the latter case one cannot simply subtract two points to obtain a vector pointing from one to the other.
All the tangent spaces have the same dimension, equal to the dimension of the manifold.
This latter quotient space is also known as the cotangent space of M at p.
en.wikipedia.org /wiki/Tangent_space   (1214 words)

  
 Space
Space Coast The Space Coast is a region in the Brevard County Washington...
Space Shuttle Pathfinder The Space Shuttle Pathfinder is a 75-Huntsville, Alabama.
A symplectic space is a vector space equipped with a bilin...
www.brainyencyclopedia.com /topics/space.html   (5756 words)

  
 Cotangent space: Definition and Links by Encyclopedian.com - All about Cotangent space
manifold is the vector space of all infinitely differentiable functions which have the value 0 at this point, divided by the subspace of all functions which also have derivative 0 at this point.
For example, if we have the cotangent bundle, it is easy to define a canonical symplectic form on it, as an exterior derivative of a one-form.
The one form assigns to a vector in the tangent bundle to the cotangent bundle the application of the element in the cotangent bundle (a linear functional) to the projection of the vector into the tangent bundle (the differential of the projection of the cotangent bundle to the original manifold).
www.encyclopedian.com /co/Cotangent-space.html   (307 words)

  
 Talk:Cotangent space - Wikipedia, the free encyclopedia
A cotangent space and a cotangent bundle are very different objects (one is a vector space, the other a manifold) and deserve different articles.
This article begins with stating that the cotangent space is something to do with a manifold, which basically means that it is the same thing as the cotangent bundle (yeah ok, not the same, but you know what I mean).
If you can give me an example of a cotangent space which has nothing to do with cotangent bundle than you can convince me that this article should be more than a redirect.
www.wikipedia.org /wiki/Talk:Cotangent_space   (644 words)

  
 Cotangent space   (Site not responding. Last check: 2007-11-05)
All cotangent spaces have the same dimension, equal to the dimension of themanifold.
Note that since the tangent space and the cotangent space at a point are both real vector spaces of the same dimension, theyare isomorphic to each other.
All the cotangent spaces of a manifold can be "glued together" to form a new differentiable manifold of twice the dimension,the cotangent bundle of the manifold.
www.therfcc.org /cotangent-space-69132.html   (637 words)

  
 A Modern Formulation of Riemann's Theory: A Supplement to Nineteenth Century Geometry
Any vector space V is automatically associated with other vector spaces, such as the dual space V* of linear functions on V, and the diverse spaces of multilinear functions on V, on V*, and on any possible combination of V and V*.
M is known as the cotangent space at P. There is a natural way of bundling together the cotangent spaces of M into a 2n-manifold, the cotangent bundle.
Generally speaking, all the vector spaces of a definite type associated with the tangent and cotangent spaces of M can be naturally bundled together into a k-manifolds (for suitable integers k, depending on the nature of the bundled items).
plato.stanford.edu /entries/geometry-19th/supplement.html   (1124 words)

  
 Meningar.com om cotangent. bundle, space, manifold mm.   (Site not responding. Last check: 2007-11-05)
All the cotangent spaces of a manifold can be "glued together" to form a new differentiable manifold of twice the dimension, the cotangent bundle In differential geometry, the cotangent bundle of a manifold is the vector bundle of all the cotan..
The cotangent bundle as phase space Symplectic form The cotangent bundle has a canonical symplectic 2-form In mathematics, in particular in abstract formulations of classical mechanics and analytical mechanics, a symplectic manifold is a smooth manifold..
Note that since the tangent space and the cotangent space at a point are both real vector spaces of the same dimension, they are isomorphic In mathematics, an isomorphism is a kind of interesting mapping between objects...
www.meningar.com /cotangent.html   (1366 words)

  
 Cotangent bundle - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-05)
In differential geometry, the cotangent bundle of a manifold is the vector bundle of all the cotangent spaces at every point in the manifold.
The cotangent bundle has a canonical symplectic 2-form on it, as an exterior derivative of a one-form.
The one-form assigns to a vector in the tangent bundle of the cotangent bundle the application of the element in the cotangent bundle (a linear functional) to the projection of the vector into the tangent bundle (the differential of the projection of the cotangent bundle to the original manifold).
xahlee.org /_p/wiki/Cotangent_bundle.html   (274 words)

  
 Encyclopedia: Tensor density
In mathematics, a manifold M is a type of space, characterized in one of two equivalent ways: near every point of the space, we have a coordinate system; or near every point, the environment is like that in Euclidean space of a given dimension.
There is the idea of vector bundle, which is a natural idea of 'vector space depending on parameters' — the parameters being in a manifold.
Where M is a Euclidean space and all the fields are taken to be invariant by translations by the vectors of M, we get back to a situation where a tensor field is synonymous with a tensor 'sitting at the origin'.
www.nationmaster.com /encyclopedia/Tensor-density   (2266 words)

  
 Cotangent space   (Site not responding. Last check: 2007-11-05)
The cotangent space at a point P on a smooth manifold M is formally defined as a quotient space of two vector spaces: it is the vector space of all infinitely differentiable functions which have the value 0 at P, divided by the subspace of all functions which also have derivative 0 at this point.
As P varies, the cotangent spaces make up the cotangent bundle of M. If M represents the set of possible positions in a dynamical system, then the cotangent bundle can be thought of as the set of possible ''positions and speeds''.
For example, the cotangent bundle has a canonical symplectic two-form on it, as an exterior derivative of a one-form.
www.portaljuice.com /cotangent_space.html   (315 words)

  
 Manifold - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-05)
In physics, differentiable manifolds serve as the phase space in classical mechanics and four dimensional pseudo-Riemannian manifolds are used to model spacetime in general relativity.
Associated with every point on a differentiable manifold is a tangent space and its dual, the cotangent space.
Roughly speaking, it is a space which locally looks like the quotient of Euclidean space by a finite group.
xahlee.org /_p/wiki/Differentiable_manifold.html   (1384 words)

  
 Outline of the course Geometry of SpaceTime   (Site not responding. Last check: 2007-11-05)
Space of tensors at a point; basis change and transformation law for components.
The equivalence principle in its weak form and Einstein's lift Gedanken experiment; (local)equivalence between uniform gravitational fields and inertial fields; gaussian coordinate systems, description of physical properties by means of geometrical properties of the spacetime continuum; relation between the principle of general covariance, Einstein's equivalence principle and theory of the gravitational field.
Relation between the operational definition of the concepts of space and time, the exchange of signals between observers and the causal structure of spacetime.
www-dft.ts.infn.it /~ansoldi/Didactics/Teaching/SpaceTimeCourse/Web/ProgEng.html   (1059 words)

  
 Tangent Spaces   (Site not responding. Last check: 2007-11-05)
Nonholonomic tangent spaces: intrinsic construction and rigid dimensions...
On The Tangent Space To The Space Of Algebraic Cycles On A Smooth Algebraic Vari...
Livre On the tangent space to the space of algebraic cycles on a smooth algebrai...
www.scienceoxygen.com /math/659.html   (144 words)

  
 Brian C. Hall - Department of Mathematics - University of Notre Dame
The cotangent bundle arises because Newton's equations are second order in time: a second-order equation on M becomes a first-order equation on the cotangent bundle of M.
Segal and Bargmann themselves worked on the case in which the configuration space M is R_ and the phase space (cotangent bundle of M) is identified with C_.
In considering the quantum theory, Wren uses coherent states for the space of connections and then attempts to "project" these into the (non-existent) "gauge-invariant subspace." This "projection" is supposed to to be accomplished by integration with respect to the (also non-existent) "Haar measure" on the infinite-dimensional group of gauge transformations.
www.nd.edu /~bhall/research   (1873 words)

  
 Glossary of differential geometry and topology B G I L M S differential topology Glossary of general topology Cotangent ...   (Site not responding. Last check: 2007-11-05)
The codimension of a submanifold is the dimension of the ambient space minus the dimension of the submanifold.
Cotangent bundle, the vector bundle of cotangent spaces on a manifold.
Vector bundle, a fiber bundle whose fibers are vector spaces and whose transition functions are linear maps.
en.powerwissen.com /9g3o3lSe9Fs263iGJVJQSQ%3D%3D_Submanifold.html   (556 words)

  
 Tangent space: Definition and Links by Encyclopedian.com - All about Tangent space
In mathematics, especially differential geometry, one attaches to every point of a differentiable manifold a tangent space, a real vector space which intuitively contains the possible "directions" in which one can pass through the given point.
In general, as in this example, all the tangent spaces have the same dimension, equal to the manifold's dimension.
While the definition via directions of curves is quite straight forward given the above intuition, it is also the most cumbersome to work with.
www.encyclopedian.com /ta/Tangent-space.html   (977 words)

  
 cm - faq   (Site not responding. Last check: 2007-11-05)
If a linear space L and its dual L* are mutually dual, why should one care which object --vector or covector-- is used to define a particular physical concept?
If one has a linear space only then indeed there is a full symmetry between these two spaces.
The difference is magically born at the moment one introduces differentiable manifold and the spaces L and L* "become" the tangent and cotangent space, respectively.
www.math.siu.edu /kocik/cm/cm-faq.htm   (143 words)

  
 Cotangent Space Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-11-05)
Looking For cotangent space - Find cotangent space and more at Lycos Search.
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Search for cotangent space - Find results for cotangent space and anything else you are looking for instantly!
www.karr.net /encyclopedia/Cotangent_space   (947 words)

  
 Differential form Gentle introduction Hardcore (but brief) definition and discussion tensors wedge product exterior ...   (Site not responding. Last check: 2007-11-05)
In differential geometry, a differential form of degree k is a smooth section of the kth exterior power of the cotangent bundle of a manifold.
In this context, they can be defined as real-valued linear functions of vectors, and they can be seen to create a dual space with regard to the vector space of the vectors they are defined over.
differential form of degree k is a smooth section of the k th exterior power of the cotangent bundle of a manifold.
en.powerwissen.com /vTqYK0Yg7aiL67xwEWHbzg%3D%3D_P-form.html   (741 words)

  
 Pullback - Enpsychlopedia   (Site not responding. Last check: 2007-11-05)
Given a function on vector spaces, a pullback can be defined on the space of tensors.
The cotangent space is dual to the tangent space, and maps on the dual space act as the transpose.
When the map f between manifolds is a diffeomorphism, that is, it is both smooth and invertible, then the pullback can be defined for the tangent space as well as for the cotangent space, and thus, by extension, for an arbitrary mixed tensor bundle on the manifold.
psychcentral.com /wiki/Pullback   (1034 words)

  
 covariant vs contravariant - Page 2 - Physics Help and Math Help - Physics Forums
In fact, the introduction of tangent and cotangent spaces allows to bypass the metric, which was the main tool to get the 'physical' invariants.
then a non zero cotangent vector, being by definition a non zero linear function on this space with real values, is determined up to a constant multiple by the subspace of tangent vectors which are mapped to zero, hence by a line through the origin.
It is a vector space having the basis, but this basis is builded by using the basis of direct vector space.
www.physicsforums.com /showthread.php?p=418331   (3806 words)

  
 Re: Fock space
So a state in CM is a point in phase space and the time evolution is given by a Hamilton function generating the symplectomorphism of motion.
Then the states in QM are complex rays in the Hilbert space.
To stay closer to CM you may use Feynman's path integral formalism and there you "sum exp(i S[x,p]) over all paths in phase space" where S[x,p]=\int dt(\dot{x} p-H) denotes the classical action as a functional of trajectories in phase space.
www.lns.cornell.edu /spr/1999-10/msg0018479.html   (577 words)

  
 Re: Phase space
However, the canonical momentum associated with v^j is p_j = dL/dv^j where L is the Lagrangian and where p_j carries a lower index because the right hand side transforms covariantly.
Hence p_j are the covariant components of a covector that lives in cotangent space.
Of course, you can make p_j into a contravariant object by raising the index by means of the inverse metric p^j = g^ji p_i yielding what is usually called the gradient of L p^j = (grad L)^j.
www.lns.cornell.edu /spr/2002-01/msg0038319.html   (475 words)

  
 Stony Brook Math Calendar
(r,d) be the moduli space of stable vector bundles of rank r with a fixed determinant of degree d.
The flow space plays the role of the unit tangent bundle, even when the manifold itself is absent.
The twistor space of a 3-Sasakian manifold is also the Salamon twistor space of the quaternion-Kähler leaf space of the foliation induced by the 3-Sasakian structure.
www.math.sunysb.edu /~calendar/scott.php?LocationID=&Date=2004-01-27   (6116 words)

  
 covariant vs contravariant - Page 2 - Physics Help and Math Help - Physics Forums
Since those 2 are vector spaces we can define bases and formulate how these 'animals' behave to a change of basis.
If you make a sketch of tangent space for manifold, you do simultaneously the sketch of cotangent space, because the tangent vector looks exactly the same as cotangent covector, e.g.
so the projective cotangent space is merely the set of lines through the origin of the tangent space.
www.physicsforums.com /showthread.php?t=58257&page=2   (3806 words)

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