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Frolkina, Olga
Topology and its applications, 04/2020, Letnik: 275Journal Article
In 1994, J. Cobb constructed a tame Cantor set in R3 each of whose projections into 2-planes is one-dimensional. We show that an Antoine's necklace can serve as an example of a Cantor set all of whose projections are one-dimensional and connected. We prove that each Cantor set in Rn, n⩾3, can be moved by a small ambient isotopy so that the projection of the resulting Cantor set into each (n−1)-plane is (n−2)-dimensional. We show that if X⊂Rn, n⩾2, is a zero-dimensional compactum whose projection into some plane Π⊂Rn with dimΠ∈{1,2,n−2,n−1} is zero-dimensional, then X is tame; this extends some particular cases of the results of D.R. McMillan, Jr. (1964) and D.G. Wright, J.J. Walsh (1982). We use the technique of defining sequences which comes back to Louis Antoine.
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