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Topological Group Language Theory
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From Finiteness to Infinity on LanguagePreliminary Note 2
[Theorem]
(Bestvina-Feighn)
G is finite representation group and is not almost abelian group.
Hn is n-dimensional hyperbolic space.
Isometric transformation group that has orientation in Hn Isom+(Hn)
G's all the faithful and discrete representation to Isom+(Hn) HomFD(G, Isom+(Hn))
Space that is divided by conjugation by the element of Isom+(Hn) HomFD(G, Isom+(Hn)) /
conj.
For a certain n, HomFD(G, Isom+(Hn)) / conj. is not compact.
G is decomposed on subgroup that is almost abelian group.
[Impression]
Process from word to Language is analogous to the situation of almost abelian group in
subgroup to not-abelian group in G.
Recognition of language is also analogous with abelian and not-abelian group in G against
finiteness of word and infinity on sentence or language.
[References]
<On recognition>
#1
Recognition
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#2
Understandability of Language
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<On word>
#3
From Cell to Manifold
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#4
Geometry of Word
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<On grammar>
#5
Grammar
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<On language>
#6
Orbit of Word
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To be continued
Tokyo February 1, 2009
Sekinan Research Field of language
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