[1] G. Hanoch: Forcing sequences. M. Sc. Thesis, Technion — Israel Institute of Technology, 1992.
[2] G. H. Hardy and E. M. Wright: An introduction to the theory of numbers, 4th ed. Oxford University Press, 1960.
[3] E. Helly: Über die Menge Konvexer mit gemeinsamen Punkten. Jahresberichte der Deutschen Mathematiker-Vereinigung 32 (1923), 175–176.
[4] D. Hershkowitz and H. Schneider:
Matrices with a sequence of accretive powers. Israel Journal of Mathematics 55 (1986), 327–344.
DOI 10.1007/BF02765030 |
MR 0876399
[5] D. Hershkowitz and H. Schneider:
Sequences, wedges and associated sets of complex numbers. Czechoslovak Mathematical Journal 38(113) (1988), 138–156.
MR 0925947
[6] A. D. Pollington:
On the density of the sequence $\lbrace \eta _k\xi \rbrace $. Illinois J. Math. 23 (1979), 511–515.
MR 0540398