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Loop group : ウィキペディア英語版
Loop group

In mathematics, a loop group is a group of loops in a topological group ''G'' with multiplication defined pointwise.
==Definition==
In its most general form a loop group is a group of mappings from a manifold to a topological group .
More specifically, let , the circle in the complex plane, and let denote the space of continuous maps , i.e.
:LG = \,
equipped with the compact-open topology. An element of is called a ''loop'' in .
Pointwise multiplication of such loops gives the structure of a topological group. Parametrize with ,
:\gamma:\theta \in S^1 \mapsto \gamma(\theta) \in G,
and define multiplication in by
:(\gamma_1 \gamma_2)(\theta) \equiv \gamma_1(\theta)\gamma_2(\theta).
Associativity follows from associativity in . The inverse is given by
:\gamma^:\gamma^(\theta) \equiv \gamma(\theta)^,
and the identity by
:e:\theta \mapsto e \in G.
The space is called the free loop group on . A loop group is any subgroup of the free loop group .

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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