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In [[mathematics]], the '''identity component''' of a [[topological group]] ''G'' is the [[connected component (topology)|connected component]] ''G''<sub>0</sub> of ''G'' that contains the [[identity element]] of the group. Similarly, the '''identity path component''' of a topological group ''G'' is the [[path component]] of ''G'' that contains the identity element of the group.  


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== Properties ==
 
The identity component ''G''<sub>0</sub> of a topological group ''G'' is a [[closed set|closed]] [[normal subgroup]] of ''G''. It is closed since components are always closed. It is a subgroup since multiplication and inversion in a topological group are [[continuous map (topology)|continuous map]]s by definition. Moreover, for any continuous [[automorphism]] ''a'' of ''G'' we have   
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:''a''(''G''<sub>0</sub>) = ''G''<sub>0</sub>.


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Thus, ''G''<sub>0</sub> is a [[characteristic subgroup]] of ''G'', so it is normal.
 
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The identity component ''G''<sub>0</sub> of a topological group ''G'' need not be [[open set|open]] in ''G''. In fact, we may have ''G''<sub>0</sub> = {''e''}, in which case ''G'' is [[totally disconnected group|totally disconnected]]. However, the identity component of a [[locally path-connected space]] (for instance a [[Lie group]]) is always open, since it contains a [[path-connected]] neighbourhood of {''e''}; and therefore is a [[clopen set]].


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The identity path component may in general be smaller than the identity component (since path connectedness is a stronger condition than connectedness), but these agree if ''G'' is locally path-connected.
 
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== Component group ==
The [[quotient group]] ''G''/''G''<sub>0</sub> is called the '''group of components''' or '''component group''' of ''G''. Its elements are just the connected components of ''G''. The component group ''G''/''G''<sub>0</sub> is a [[discrete group]] if and only if ''G''<sub>0</sub> is open. If ''G'' is an [[affine algebraic group]] then ''G''/''G''<sub>0</sub> is actually a [[finite group]].


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One may similarly define the path component group as the group of path components (quotient of ''G'' by the identity path component), and in general the component group is a quotient of the path component group, but if ''G'' is locally path connected these groups agree. The path component group can also be characterized as the zeroth [[homotopy group]], <math>\pi_0(G,e).</math>
 
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==Examples==
*The group of non-zero real numbers with multiplication ('''R'''*,•) has two components and the group of components is ({1,&minus;1},•).
*Consider the [[group of units]] ''U'' in the ring of [[split-complex number]]s. In the ordinary topology of the plane {''z'' = ''x'' + j ''y'' : ''x'', ''y'' ∈ '''R'''}, ''U'' is divided into four components by the lines ''y'' = ''x'' and ''y'' = &minus; ''x'' where ''z'' has no inverse. Then ''U''<sub>0</sub> = { ''z'' : |''y''| < ''x'' } . In this case the group of components of ''U'' is isomorphic to the [[Klein four-group]].


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==References==
 
*[[Lev Semenovich Pontryagin]], ''Topological Groups'', 1966.
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[[Category:Topological groups]]
 
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Revision as of 04:33, 24 November 2013

In mathematics, the identity component of a topological group G is the connected component G0 of G that contains the identity element of the group. Similarly, the identity path component of a topological group G is the path component of G that contains the identity element of the group.

Properties

The identity component G0 of a topological group G is a closed normal subgroup of G. It is closed since components are always closed. It is a subgroup since multiplication and inversion in a topological group are continuous maps by definition. Moreover, for any continuous automorphism a of G we have

a(G0) = G0.

Thus, G0 is a characteristic subgroup of G, so it is normal.

The identity component G0 of a topological group G need not be open in G. In fact, we may have G0 = {e}, in which case G is totally disconnected. However, the identity component of a locally path-connected space (for instance a Lie group) is always open, since it contains a path-connected neighbourhood of {e}; and therefore is a clopen set.

The identity path component may in general be smaller than the identity component (since path connectedness is a stronger condition than connectedness), but these agree if G is locally path-connected.

Component group

The quotient group G/G0 is called the group of components or component group of G. Its elements are just the connected components of G. The component group G/G0 is a discrete group if and only if G0 is open. If G is an affine algebraic group then G/G0 is actually a finite group.

One may similarly define the path component group as the group of path components (quotient of G by the identity path component), and in general the component group is a quotient of the path component group, but if G is locally path connected these groups agree. The path component group can also be characterized as the zeroth homotopy group,

Examples

  • The group of non-zero real numbers with multiplication (R*,•) has two components and the group of components is ({1,−1},•).
  • Consider the group of units U in the ring of split-complex numbers. In the ordinary topology of the plane {z = x + j y : x, yR}, U is divided into four components by the lines y = x and y = − x where z has no inverse. Then U0 = { z : |y| < x } . In this case the group of components of U is isomorphic to the Klein four-group.

References