### 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
- Genearlizations 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

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

# 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