I am very interested in learning more about Kakeya set. The last
chapter of the book introduces the regulatity property enjoyed by all
measurable subsets of R^d except when d=2, due to the existence of
Kakeya set. I want to read more materials in this subject later. Here
is a thought after reading the proof: I hope to think about another
proof of the fact that m(C+aC)=0 for almost all a\in R, where C is
cantor set, with the dissection 1/2 instead of 1/3.