I am now thinking on the boundary of language. Is there any boundary on language? If in language there be any variation, there will be occurred any working of boundary, distinction of changeable part and unchangeable part. Rune Tom's cobortism and cobortism group are now highly concerned for me.
Tom's Theorem
n is positive integer.
When n is not multiple of 4, oriented cobortism group is finite group.
From early time of my study of language universals, finite generation of words and infinitive generation of sentences are always have been concerned.
The early time's papers are shown below for some references.
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