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Pieter Mostert Add us as a preferred source on Google

Mastodon @pieter@mathstodon.xyz 📍 South Africa

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Followers

116

Account age

3 yrs

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Known for

Peter Selinger now has an app
https://www.mathstat.dal.ca/~selinger/hat-partition/ that lets you create hat tilings using the Markov partition described in his paper with Sébastien Labbé (https://arxiv.org/abs/2604.20964). For a printable version of this, see Sébastien's blog post: http://www.slabbe.org/blogue/2026/03/a-construction-of-the-hat-tilings-by-a-markov-partition/
#aperiodicMonotile #til

27 views Peter Selinger now has an app https://www.mathstat.dal.ca/~selinger/hat-partition/ that lets you create hat tilings using the Markov partition described in his paper with Sébastien Labbé (https://arxiv.org/abs/2604.20964). For a printable version of this, see Sébastien's blog post: http://www.slabbe.org/blogue/2026/03/a-construction-of-the-hat-tilings-by-a-markov-partition/ #aperiodicMonotile #til

15 views Taking some time away from the herd. #sea #cow $As a follow up to last week's post on Markov partitions for Hat (hat and turtle) and Spectre (hats in turtles and turtles in hats) tilings (https://mathstodon.xyz/@pieter/116484517078239617), here is a way of colouring such tilings. For each control point, we colour the tile according to its distance from the boundary of the fractal window it lies in. The first image shows a patch of a turtle tili$ 13 views As a follow up to last week's post on Markov partitions for Hat (hat and turtle) and Spectre (hats in turtles and turtles in hats) tilings (https://mathstodon.xyz/@pieter/116484517078239617), here is a way of colouring such tilings. For each control point, we colour the tile according to its distance from the boundary of the fractal window it lies in. The first image shows a patch of a turtle tili

12 views #textureTuesday

📊 Post engagement

📊 Activity & format

Posting cadence

1.2 / week

A lower-frequency account — each post lands with more weight.

Content mix

Mostly images

Recent: 0 text · 12 image · 0 video.

Follower / following

1.5×

Follows 77 back. A more reciprocal / networked account.

Recent posts

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🔥 Top post Peter Selinger now has an app https://www.mathstat.dal.ca/~selinger/hat-partition/ that lets you create hat tilings using the Markov partition described in his paper with Sébastien Labbé (https://arxiv.org/abs/2604.20964). For a printable version of this, see Sébastien's blog po… ★ 27

#SilentSunday ★ 10

I saw my first whales of the season yesterday, a lone mother and calf. Pretty sure these are Southern Rights, which are much less common around here than Humpbacks. They were fairly close to shore, but as usual, my phone camera did a lous… ★ 8

Jarkko Kari, Sébastien Labbé and I have a pre-print on the arXiv on a sufficient condition for proving non-periodicity of Wang tiles with vertical and horizontal stripes: https://arxiv.org/abs/2606.24693 There's a nice connection to quadr… ★ 1

#textureTuesday ★ 12

The old milkwoods growing next to the Mncwasa river estuary have some really interesting lichen growing on them. #lichenSubscribe ★ 5

#silentSunday ★ 4

Here is the same idea applied to a Spectre tiling. (2/2) ★ 2

As a follow up to last week's post on Markov partitions for Hat (hat and turtle) and Spectre (hats in turtles and turtles in hats) tilings (https://mathstodon.xyz/@pieter/116484517078239617), here is a way of colouring such tilings. For ea… ★ 13

Taking some time away from the herd. #sea #cow ★ 15

Lastly, we turn our attention to the Spectre tiling. Things are much the same as before, although since the deflation involves a reflection, we need to use a vector $v$ such that $𝑣𝑀=λ𝑣̅,$ instead of a left eigenvector. The two image… ★ 3

To get the turtle Markov partition I started off with, you can follow the same steps, but using the projection along $(1, \xi^2)$ instead of $(1,-1)$, and them moving the control point to the underside of the turtle's shell. By good fo… ★ 3

🐘 Community & instance

Home server

mathstodon.xyz

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On Mastodon since

May 2023

An established account with real history on the platform.

💡 Facts

🗓️Joined Mastodon in 2023 — 3 years ago.

👁️Averages 9 views per post.

📤Posts about 1.2× per week.

📍Based in South Africa.

🕵️ Fake follower check

Estimated

66/100

Good Credibility score

89%

Real Real audience

Low Fake-follower risk

High Data confidence

Est. 89% real, active audience · Low fake-follower risk.
Engagement (~7.8% of followers engage each post) is around typical for Mastodon.
Established account (3+ years old).

Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.

About

I'm a former potter with a maths background, and currently work with data at a rural education NGO in South Africa.

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Pieter Mostert Add us as a preferred source on Google

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