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Test sets for finite substitutions

✍ Scribed by M.H. Albert; J. Lawrence

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
330 KB
Volume
43
Category
Article
ISSN
0304-3975

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A relation F on a set X defines a function on the power set of X. A subset of X is said to be invariant for F if it is a fixed point for F. An element x of X is called ascendable in X if there exists an infinite sequence Xo=X, Xt,..., (not necessarily distinct) in X such that xieF(xi+l ) (i>~O). The