Geodesic
Construction of an Uncountable Difference between ${\mit\Phi}(B)$ and ${\mit\Phi}_f(B)$
Josh Campbell 1   ; David Swanson 1
1 Department of Mathematics St. Olaf College Northfield, MN 55057, U.S.A.
Bulletin of the Polish Academy of Sciences. Mathematics, Tome 56 (2008) no. 2, pp. 121-130 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We construct a set $B$ and homeomorphism $f$ where $f$ and $f^{-1}$ have property N such that the symmetric difference between the sets of density points and of $f$-density points of $B$ is uncountable.
DOI : 10.4064/ba56-2-4
Keywords: construct set homeomorphism where have property symmetric difference between sets density points f density points uncountable

Josh Campbell  1   ; David Swanson  1

1 Department of Mathematics St. Olaf College Northfield, MN 55057, U.S.A. 
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     title = {Construction of an {Uncountable} {Difference} 
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     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
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Josh Campbell; David Swanson. Construction of an Uncountable Difference 
between ${\mit\Phi}(B)$ and ${\mit\Phi}_f(B)$. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 56 (2008) no. 2, pp. 121-130. doi: 10.4064/ba56-2-4

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