Positive measure for restricted projections along smooth non-degenerate curves
Seonghun JeonChangkeun Oh
所有作者
Seonghun JeonChangkeun Oh
文献摘要
Let 1≤m<n, and let γ:[0,1]→Rn be a smooth non-degenerate curve. For θ∈[0,1], set Vθ:=span{γ′(θ),…,γ(m)(θ)}, and let πθ denote the orthogonal projection onto Vθ. We prove that if E⊂Rn is a Borel set with dimHE>m, then Hm(πθ(E))>0 for almost every θ∈[0,1].