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Topic: Connected space


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In the News (Wed 19 Jun 19)

  
  PlanetMath: example of a connected space that is not path-connected
This standard example shows that a connected topological space need not be path-connected (the converse is true, however).
"example of a connected space that is not path-connected" is owned by yark.
This is version 9 of example of a connected space that is not path-connected, born on 2002-06-10, modified 2005-02-06.
planetmath.org /encyclopedia/ExampleOfAConnectedSpaceWhichIsNotPathConnected.html   (263 words)

  
  Connected space - Wikipedia, the free encyclopedia
Connectedness is one of the principal topological properties that is used to distinguish topological spaces.
The connected components of a space are disjoint unions of the path-connected components.
The closure of a connected subset is connected.
en.wikipedia.org /wiki/Connected_space   (1225 words)

  
 Connected - Wikipedia, the free encyclopedia
In topology, a connected space is a topological space that cannot be partitioned into two open sets.
In geometric topology, a connected sum of two connected m-dimensional manifolds is a manifold formed by deleting an open ball inside each manifold and gluing together the resulting boundary spheres.
In graph theory, a connected graph is a graph in which each pair of vertices is joined by a path.
en.wikipedia.org /wiki/Connected   (250 words)

  
 Topological space
The category of all topological spaces, Top, with topological spaces as objects and continuous functions as morphisms is one of the fundamental categories in all mathematics.
A space carries the trivial topology if all points are "lumped together" in the sense that there are only two open sets, the empty set and the whole space.
A space is regular if whenever C is a closed set and p is a point not in C, then C and p have disjoint neighbourhoods.
www.guajara.com /wiki/en/wikipedia/t/to/topological_space.html   (1999 words)

  
 Simply connected space - Wikipedia, the free encyclopedia
Formally, such a simple object is called a connected space, but for our informal definition, we can just think of a simple object as being an object that's all one piece.
An equivalent formulation is this: X is simply connected if and only if it is path connected, and whenever p : [0,1] → X and q : [0,1] → X are two paths (i.e.: continuous maps) with the same start and endpoint (p(0) = q(0) and p(1) = q(1)), then p and q are homotopic relative {0,1}.
If a space X is not simply connected, one can often rectify this defect by using its universal cover, a simply connected space which maps to X in a particularly nice way.
en.wikipedia.org /wiki/Simply_connected   (973 words)

  
 [No title]
For any two liftings of a connected object, there is a covering transformation that carries one to the other, provided that the covering space is connected and locally path-connected.
Given a vector space of functions of a parameter or functions on a manifold, an operator may have a kernel or matrix whose rows and columns are indexed by the parameter or by points on the manifold.
PL flow A "piecewise linear" motion on a space or a manifold, akin to a flow given by a vector field, in which every particle in a given simplex of some triangulation moves with constant velocity and in the same direction, so that the particle trajectories are polygons.
www.ornl.gov /sci/ortep/topology/defs.txt   (5717 words)

  
 Connected@Everything2.com
Definition A topological space X is said to be disconnected if there are nonempty subsets A,B of X such that AnB={}, AuB=X, and A and B are both open in X. Since A and B are complements in X, it follows that they must both be closed.
A subset Y of a topological space is connected if Y is connected in the subspace topology inherited from X. This definition sounds a bit odd at first, but it does give the desired effect - that is, the spaces you would expected to be connected are, and vice versa.
Since the definition of connectedness is in negative terms, stating that a space is not disconnected, all the main proofs are by contradition.
everything2.com /index.pl?node=connected   (1013 words)

  
 Encyclopedia: Simply connected space   (Site not responding. Last check: )
For instance, a doughnut (with hole) is not simply connected, but a ball (even a hollow one) is. A circle is not simply connected but a disk and a line are.
In mathematics and astronomy, Euclidean space is a generalization of the 2- and 3-dimensional spaces studied by Euclid.
In mathematics, a topological vector space X is a real or complex vector space which is endowed with a Hausdorff topology such that vector addition X × X → X and scalar multiplication K × X → X are continuous (where the product topologies are used and the base field K carries its standard...
www.nationmaster.com /encyclopedia/Simply-connected-space   (2038 words)

  
 Topology MAT 530
All connected subsets of the real line are open intervals (that may be empty and may be infinite) with, possibly, some of the ends attached.
A path connecting two points of a topological space is a continuous map from a segment to this space such that the ends of the segment get mapped to given two points.
The Urysohn lemma states that for a normal topological space X and two disjoint closed subsets A and B of it, there exists a continuous function from X to [0,1] that is 0 on A and 1 on B.
www.math.sunysb.edu /~timorin/mat530.html   (2896 words)

  
 Connected and Path Connected
Connected and path connected are not equivalent, as shown by the curve sin(1/x) on (0,1] union the origin.
This is a connected half open interval, and its image under the continuous function f is connected.
Suppose c, one of the component spaces, is not connected.
www.mathreference.com /top,connect.html   (1785 words)

  
 Algebraic Topology: Topology
A topological space is a set X together with a collection of subsets OS the members of which are called open, with the property that (i) the union of an arbitrary collection of open sets is open, and (ii) the intersection of a finite collection of open sets is open.
A topological space is called metric when there is a distance function determining the topology (i.e., open balls for the metric are open sets, and conversely, if a point x lies in an open set U then for some positive e the ball with radius e around x is contained in U.
A Hausdorff space X is normal if and only if for each pair of disjoint closed sets A and B there exists a map f from X to the unit interval I that is identically 0 on A and identically 1 on B.
www.win.tue.nl /~aeb/at/algtop-2.html   (1509 words)

  
 [No title]
A loop space L := (L; BL; e) is a triple consisting of two spaces L and BL, * *which is pointed, and an equivalence e : BL!- L between the loop space of BL and L.
For every compact connected Lie group G there exists a finite covering K!- Gs x T!- G of compact Lie groups where Gs is simply connected, where T is a torus and where K Gs x T is a finite central subgroup.
If X is a connected p-compact group with the same p-adic Weyl group type as a compact connected Lie group G, then both have the same rank and we can identitify the two maximal tori as well as the Weyl groups.
hopf.math.purdue.edu /Moller-Notbohm/flst.txt   (9142 words)

  
 PlanetMath: connected space
can be viewed as a collection of subspaces each of which are connected.
See Also: semilocally simply connected, extremally disconnected, example of a connected space that is not path-connected, locally connected, proof of generalized intermediate value theorem, a connected normal space with more than one point is uncountable
This is version 12 of connected space, born on 2001-11-17, modified 2006-08-10.
planetmath.org /encyclopedia/ConnectedSpace.html   (131 words)

  
 Simply connected space - ExampleProblems.com
For instance, a doughnut (with hole) is not simply connected, but a ball (even a hollow one) is. A circle is not simply connected but a disk and a line are.
Formally, such a simple object is called a connected space, but for our informal definition, we can just think of a simple object as being an object that's all one piece.
If a space X is not simply connected, one can often rectify this defect by using its universal cover, a simply connected space which maps to X in a particularly nice way.
www.exampleproblems.com /wiki/index.php/Simply_connected_space   (854 words)

  
 Connected space Article, Connectedspace Information
In topology and related branches of mathematics, a topological space is said to beconnected if it cannot be divided into two disjoint nonempty open sets whose union is the entire space.
The space X is said to be path-connected if for any two points x and y in X thereexists a continuous function f from the unit interval [0,1] to X with f(0) = x and f(1) = y.
The components form a partition of the space (that is, they are disjoint andtheir union is the whole space).
www.anoca.org /path/open/connected_space.html   (532 words)

  
 Connectedness
R with its usual topology is not connected since the sets [0, 1] and [2, 3] are both open in the subspace topology.
The spaces [0, 1] and (0, 1) (both with the subspace topology as subsets of R) are not homeomorphic.
A similar method may be used to distinguish between the non-homeomorphic spaces obtained by thinking of the letters of the alphabet as in Exercises 1 question 1.
www-groups.dcs.st-and.ac.uk /~john/MT4522/Lectures/L19.html   (619 words)

  
 connected - Search Results - MSN Encarta
Only connect the prose and the passion, and both will be exalted, and human love will be seen at...
The only liberty I mean, is a liberty connected with order; that not only exists along with order and virtue, but which cannot exist at all without...
In topology and related branches of mathematics, a connected space is a topological space which cannot be represented as the disjoint union of two or more nonempty open spaces.
encarta.msn.com /encnet/refpages/search.aspx?q=connected   (196 words)

  
 Effect of w/c ratio
The abscissa in both plots is total capillary porosity φ, and the ordinate is the fraction of the capillary pore space that forms a connected cluster spanning the computational cell.
4a, nearly overlap, as the capillary pore space never becomes less than 70% connected, so that the leaching process is, to a good approximation, merely the reverse of hydration in terms of its effects on pore space connectivity.
Since it is the spanning part of the pore space that carries the majority of the flow, a larger fraction of the pore space being connected will result in higher diffusivity values [6].
ciks.cbt.nist.gov /garbocz/paper26/node8.html   (1655 words)

  
 Exercises 8
Prove or disprove: The image of a Hausdorff space under a continuous map is Hausdorff.
Prove that a space X is connected if and only if the only continuous maps from X to Y are the two constant maps which map the whole of X to either a or b.
Is the space R with the topology of Question 2 a connected space?
www-groups.dcs.st-and.ac.uk /~john/MT4522/Tutorials/T8.html   (262 words)

  
 Connected space : Connectedness   (Site not responding. Last check: )
Equivalently, it can't be divided into two disjoint nonempty closed sets (since the complement of an open set is closed).
Some authorities accept the empty set (with its unique topology) as a connected space, while others do not.
The topologist's sine curve shown above is an example of a connected space that isn't locally connected.
www.findword.org /co/connectedness.html   (728 words)

  
 Connected space   (Site not responding. Last check: )
In topology and related branches of mathematics, a topological space is said to be connected if it cannot be divided into two disjoint nonempty open set s whose union is the entire space.
A subset of a topological space is said to...
A space X is said to be arc-connected if any two distinct points can be joined by an arc, that is a path f which is a homeomorphism between the unit interval and its image f([0,1).
www.33beat.com /Connected_space.html   (657 words)

  
 elearnspace
A connection is so subtle that its power and impact are often overlooked.
While not the source of the foundational value of connections, social software and the participative web are great mirrors of their underlying presence.
Jon Lebkowsky highlights the vital nature of nodes with which to connect: "When I first got an email account in the 1980's, its value was practically zero because there were so few email users and nobody I knew had it.
www.elearnspace.org /blog   (1030 words)

  
 Connected Space Encyclopedia Article, Description, History and Biography @ ArtisticNudity.com   (Site not responding. Last check: )
Looking For connected space - Find connected space and more at Lycos Search.
Find connected space - Your relevant result is a click away!
Look for connected space - Find connected space at one of the best sites the Internet has to offer!
www.artisticnudity.com /encyclopedia/Connected_space   (1327 words)

  
 SECEFPrimer
Space weather is a complex series of events that begin deep inside the Sun, and extend throughout the solar system, carried by the solar wind.
Most of this weather is both invisible and benign, but occasional severe storms can shake the Earth's magnetic field and spawn aurora, electrical power flouts and satellite outages.
Space weather comes in 11-year cycles that are in step with the ebb and flow of solar activity.
sunearth.gsfc.nasa.gov /sechtml/tut.html   (271 words)

  
 CONNECTED: Space Update & Earth Update system requirements
The first time you install Space Update, a high-speed internet is essential to download the sky movies, if you wish a different latitude or year from the one on the disk.
You need 450 MB of free hard disk space for all of SPACE UPDATE, or 50-140 MB free if you only wish to show one of the modules (Sky Tonight is the largest because of the skyview movies included).
WE ONLY SEND EMAIL TO The "Public Connection": is an outreach arm of the Rice Space Institute at Rice University in collaboration with the Houston Museum of Natural Science [ Project Director: Patricia Reiff ].
spaceupdate.com /connected/system_req.html   (336 words)

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