Israel Journal of Mathematics

, Volume 97, Issue 1, pp 221–238

Projecting the one-dimensional Sierpinski gasket



LetS⊂ℝ2 be the Cantor set consisting of points (x,y) which have an expansion in negative powers of 3 using digits {(0,0), (1,0), (0,1)}. We show that the projection ofS in any irrational direction has Lebesgue measure 0. The projection in a rational directionp/q has Hausdorff dimension less than 1 unlessp+q ≡ 0 mod 3, in which case the projection has nonempty interior and measure 1/q. We compute bounds on the dimension of the projection for certain sequences of rational directions, and exhibit a residual set of directions for which the projection has dimension 1.


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Copyright information

© Hebrew University 1997

Authors and Affiliations

  1. 1.CNRS UMR 128, Ecole Normale Superieure de LyonLyonFrance

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