10 citations
- Bar-Ilan UniversityIL1 paper
- Ben-Gurion University of the NegevIL1 paper
- Boise State UniversityUS1 paper
- California Institute of TechnologyUS1 paper
- Hebrew University of JerusalemIL1 paper
- King's College LondonGB1 paper
- King's College SchoolGB1 paper
- The King's CollegeUS1 paper
- University of FloridaUS1 paper
4 papers · 1 filter
Duality and the pcf theory
Saharon Shelah, Jindrich Zapletal
We consider natural cardinal invariants hm_n and prove several duality theorems, saying roughly: if I is a suitably definable ideal and provably cov(I)>=hm_n, then non(I) is provab…
On the connection between affine and projective fundamental groups of line arrangements and curves
David Garber
In this note we prove a decomposition related to the affine fundamental group and the projective fundamental group of a line arrangement and a reducible curve with a line component…
Strongly meager sets of size continuum
Tomek Bartoszynski, Saharon Shelah
We construct several models where there are no strongly meager sets of size continuum. In particular, there are no such sets in the Laver's model.
A Markov partition for the Feigenbaum dynamics
Genadi Levin
We build a Markov partition of the Feigenbaum dynamical plane, and a system of "external rays", which are invariant under rescaling. Applications to geometry of the Feigenbaum map…