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Square-Brackets Partition Relations Dowker space Amenable C-sequence weak diamond Club Guessing free Souslin tree approachability ideal Lipschitz reduction Cohen real Subtle cardinal Postprocessing function Closed coloring Forcing Axioms Generalized descriptive set theory OCA Small forcing Distributive tree Subtle tree property Rainbow sets Microscopic Approach 54G20 Ulam matrix Ostaszewski square Subnormal ideal incompactness Almost-disjoint family P-Ideal Dichotomy Minimal Walks Sigma-Prikry AIM forcing Singular cardinals combinatorics very good scale L-space Constructible Universe unbounded function C-sequence strongly bounded groups Singular Density Sakurai's Bell inequality Uniformly homogeneous Nonspecial tree Singular cofinality diamond star ccc Axiom R Kurepa Hypothesis HOD tensor product graph Iterated forcing higher Baire space nonmeager set Almost countably chromatic weak square positive partition relation transformations Reduced Power regressive Souslin tree Successor of Regular Cardinal Fodor-type reflection Foundations Sierpinski's onto mapping principle Was Ulam right indecomposable ultrafilter Diamond for trees Absoluteness ZFC construction Cardinal function Uniformization middle diamond Hedetniemi's conjecture Slim tree Cardinal Invariants club_AD countably metacompact free Boolean algebra Luzin set Jonsson cardinal Almost Souslin Ascent Path sap Ineffable cardinal PFA(S)[S] Chromatic number Dushnik-Miller Prikry-type forcing Uniformly coherent PFA GMA Filter reflection Rado's conjecture Poset Mandelbrot set Diamond Large Cardinals Ramsey theory over partitions stationary reflection Fat stationary set O-space b-scale Analytic sets Well-behaved magma Hereditarily Lindelöf space Erdos Cardinal S-Space square Chang's conjecture reflection principles Strongly Luzin set Knaster and friends Prevalent singular cardinals Shelah's Strong Hypothesis xbox Knaster square principles Coherent tree Martin's Axiom Successor of Singular Cardinal Partition Relations projective Boolean algebra Rock n' Roll Generalized Clubs Non-saturation Whitehead Problem SNR Reflecting stationary set Antichain stationary hitting Precaliber Souslin Tree Local Club Condensation. Selective Ultrafilter specializable Souslin tree Parameterized proxy principle coloring number Strong coloring Diamond-sharp Erdos-Hajnal graphs Universal Sequences Greatly Mahlo Vanishing levels Fast club Weakly compact cardinal Aronszajn tree Forcing Open Access super-Souslin tree Subadditive polarized partition relation stick weak Kurepa tree full tree Hindman's Theorem Commutative cancellative semigroups
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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