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Dynamics of flows and maps (continuous and discrete time), including infinite-dimensional dynamics, Hamiltonian dynamics, ergodic theory.

30 votes
2 answers
2k views

Fractal-like structures arising from the action of a group on $\mathbb{Z}^2$

Let $G := \langle a, b, c \rangle < {\rm Sym}(\mathbb{Z}^2)$ be the group generated by the permutation $$ a: \ (m,n) \ \mapsto \ (m-n,m) $$ of order $6$ and the involutions $$ b: \ (m,n) \ \mapsto …
Stefan Kohl's user avatar
  • 19.6k
16 votes
1 answer
1k views

Are the algebraic numbers dense everywhere on the boundary of the Mandelbrot set?

Let $\mathcal{B}$ denote the boundary of the Mandelbrot set, and let $\overline{\mathbb{Q}}$ denote the algebraic closure of the rationals. Further put $\mathcal{B}_{\overline{\mathbb{Q}}} := \mathcal …
Stefan Kohl's user avatar
  • 19.6k
13 votes
Accepted

A question on Collatz's conjecture:proportion of "low flying" orbits

If the sequence $(T(N))_{N \in \mathbb{N}}$ converges and the limit is not equal to $0$, this would imply either positive predecessor density for $1$, cf. e.g. Günther J. Wirsching, On the problem of …
Stefan Kohl's user avatar
  • 19.6k