### Archives

### Recent blog posts

- Prikry forcing may add a Souslin tree June 12, 2016
- The reflection principle $R_2$ May 20, 2016
- Prolific Souslin trees March 17, 2016
- Generalizations of Martin’s Axiom and the well-met condition January 11, 2015
- Many diamonds from just one January 6, 2015
- Happy new jewish year! September 24, 2014
- Square principles April 19, 2014
- Partitioning the club guessing January 22, 2014

### Keywords

Microscopic Approach PFA(S)[S] Whitehead Problem Jonsson cardinal Parameterized proxy principle very good scale Erdos-Hajnal graphs Chromatic number reflection principles Successor of Singular Cardinal Poset Stevo Todorcevic Square-Brackets Partition Relations Souslin Tree Hedetniemi's conjecture Reduced Power Knaster Almost Souslin Shelah's Strong Hypothesis Successor of Regular Cardinal Martin's Axiom HOD tensor product graph 05A17 Large Cardinals 05D10 Foundations Nonspecial tree Ascent Path Forcing Axioms Axiom R 11P99 stationary hitting S-Space incompactness Rock n' Roll Singular Density Partition Relations Distributive tree Commutative cancellative semigroups Aronszajn tree Singular coﬁnality Uniformization weak diamond Fodor-type reflection Cardinal function PFA square principles b-scale Absoluteness 20M14 Dushnik-Miller Erdos Cardinal middle diamond stationary reflection Ostaszewski square Singular cardinals combinatorics Selective Ultrafilter ccc Rado's conjecture Hereditarily Lindelöf space Fast club Forcing Almost-disjoint famiy free Boolean algebra Generalized Clubs Sakurai's Bell inequality Universal Sequences OCA Chang's conjecture projective Boolean algebra polarized partition relation Cardinal Invariants Coherent tree sap Small forcing Antichain weak square Minimal Walks Uniformly coherent Almost countably chromatic Fat stationary set Kurepa Hypothesis Cohen real Prevalent singular cardinals Hindman's Theorem square Mandelbrot set Non-saturation L-space Club Guessing P-Ideal Dichotomy Diamond Prikry-type forcing Constructible Universe xbox Rainbow sets diamond star coloring number approachability ideal Postprocessing function Weakly compact cardinal Slim tree

# Tag Archives: Mandelbrot set

## A natural Mandelbrot set

Chris Hadfield is a Canadian astronaut, with a very high-profile twitter account. He posts there beautiful photos everyday, and I (plus half a million followers) enjoy it very much. Today, Chris posted the following picture: and I find it quite … Continue reading