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Comments in green were written by me. Comments in blue were not written by me.
2025-12-24
Thanks again for an advent full of brain teasers. Merry Christmas!
Gert-Jan
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Chalkdust issue 17
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Mathsteroids on hyperbolic surfaces
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The databet
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Off-by-one errors
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24 Hour Maths Game Show
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Approximating π
Feb 2022
Build your own MENACE
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2020
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Jul 2020
Happy -6+τφ Approximation Day!
May 2020
A surprising fact about quadrilaterals
Interesting tautologies
Mar 2020
Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2
Jan 2020
PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
2019
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Dec 2019
Visualising MENACE's learning
Christmas card 2019
Nov 2019
Christmas (2019) is coming!
Sep 2019
A non-converging LaTeX document
TMiP 2019 treasure punt
Jul 2019
Big Internet Math-Off stickers 2019
Jun 2019
Proving a conjecture
Apr 2019
Harriss and other spirals
Mar 2019
realhats
Jan 2019
Christmas (2018) is over
2018
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Dec 2018
Christmas cross stitch
MENACE in fiction
Christmas card 2018
Nov 2018
Christmas (2018) is coming!
Sep 2018
Runge's Phenomenon
Jul 2018
World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
May 2018
A bad Puzzle for Today
Apr 2018
Building MENACEs for other games
Mar 2018
A 20,000-to-1 baby?
World Cup stickers 2018
Jan 2018
Origins of World War I
Christmas (2017) is over
2017
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Dec 2017
Christmas card 2017
Nov 2017
Christmas (2017) is coming!
MENACE at Manchester Science Festival
Jun 2017
Big Ben Strikes Again
Mar 2017
The end of coins of constant width
Dragon curves II
Feb 2017
The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
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Christmas (2016) is over
Video game surfaces
Christmas card 2016
Nov 2016
Christmas (2016) is coming!
Oct 2016
Logical contradictions
Palindromic dates
Sep 2016
Tube map kaleidocycles
Jul 2016
Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
May 2016
Euro 2016 stickers
Mar 2016
Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
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Christmas (2015) is coming!
Oct 2015
How to kick a conversion
How much will I win on the new National Lottery?
Aug 2015
How OEISbot works
MENACE
Mar 2015
Optimal Pac-Man
Tube map stellated rhombicuboctahedron
Logic bot, pt. 2
Design your own flexagon
Jan 2015
Tube map Platonic solids, pt. 3
2014
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Nov 2014
Logic bot
Sep 2014
Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
Apr 2014
Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
New machine unfriendly £1 coin
2013
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Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
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Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
golden ratio
estimation
bempp
draughts
numerical analysis
wordle
quadrilaterals
zines
data
computational complexity
thirteen
crosswords
tetris
harriss spiral
pascal's triangle
bubble bobble
partridge puzzle
pac-man
simultaneous equations
databet
kenilworth
graphs
bluesky
rhombicuboctahedron
dataset
pokémon wordle
christmas card
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menace
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nonograms
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correlation
arrangement puzzles
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logo
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inverse matrices
people maths
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countdown
go
pi
nine men's morris
reuleaux polygons
pi approximation day
matrix of cofactors
fonts
folding tube maps
convergence
fence posts
exponential growth
matrices
oeis
golden spiral
european cup
chalkdust magazine
realhats
the aperiodical
sound
mathsjam
national lottery
pokémon
dragon curves
rust
24 hour maths
live stream
reddit
sorting
weak imposition
runge's phenomenon
numbers
flexagons
gaussian elimination
datasaurus dozen
cambridge
talking maths in public
geogebra
trigonometry
frobel
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logs
gerry anderson
latex
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news
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boundary element methods
error bars
palindromes
statistics
matrix of minors
big internet math-off
london
crochet
preconditioning
dinosaurs
alphabets
game of life
kings
a gamut of games
matt parker
wave scattering
anscombe's quartet
manchester science festival
machine learning
errors
royal baby
books
data visualisation
interpolation
tennis
platonic solids
manchester
braiding
weather station
wool
triangles
guest posts
squares
game show probability
coins
misleading statistics
martin gardner
phd
hexapawn
php
plastic ratio
raspberry pi
speed
coventry
standard deviation
ucl
propositional calculus
recursion
final fantasy
youtube
noughts and crosses
approximation
regular expressions
python
probability
logic
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ternary
inline code
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craft
advent calendar
christmas
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Archive
Show me a random blog post
▼ show ▼
▲ hide ▲
2026
May 2026
World Cup stickers 2026
Apr 2026
A new puzzle every day
Mixing Wordle with other games
Feb 2026
Christmas (2025) is over
2025
Dec 2025
Christmas card 2025
Nov 2025
Christmas (2025) is coming!
Sep 2025
The partridge puzzle
Aug 2025
TMiP 2025 puzzle hunt
Jun 2025
A nonogram alphabet
Mar 2025
How to write a crossnumber
Jan 2025
Christmas (2024) is over
Friendly squares
2024
Dec 2024
A regular expression Christmas puzzle
Christmas card 2024
Nov 2024
Christmas (2024) is coming!
Feb 2024
Zines, pt. 2
Jan 2024
Christmas (2023) is over
2023
▼ show ▼
▲ hide ▲
Dec 2023
Christmas card 2023
Nov 2023
Christmas (2023) is coming!
Zines
Sep 2023
TMiP 2023 puzzle hunt
May 2023
Chalkdust issue 17
Apr 2023
Logo Asteroids
Mar 2023
Mathsteroids on hyperbolic surfaces
Feb 2023
The databet
Jan 2023
Christmas (2022) is over
2022
▼ show ▼
▲ hide ▲
Dec 2022
Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
Oct 2022
24 Hour Maths Game Show
Mar 2022
Approximating π
Feb 2022
Build your own MENACE
Jan 2022
Christmas (2021) is over
2021
▼ show ▼
▲ hide ▲
Dec 2021
Christmas card 2021
Nov 2021
Christmas (2021) is coming!
Sep 2021
TMiP 2021 puzzle hunt
May 2021
Close encounters of the second kind
Jan 2021
Christmas (2020) is over
2020
▼ show ▼
▲ hide ▲
Dec 2020
Christmas card 2020
Nov 2020
Christmas (2020) is coming!
Jul 2020
Happy -6+τφ Approximation Day!
May 2020
A surprising fact about quadrilaterals
Interesting tautologies
Mar 2020
Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2
Jan 2020
PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
2019
▼ show ▼
▲ hide ▲
Dec 2019
Visualising MENACE's learning
Christmas card 2019
Nov 2019
Christmas (2019) is coming!
Sep 2019
A non-converging LaTeX document
TMiP 2019 treasure punt
Jul 2019
Big Internet Math-Off stickers 2019
Jun 2019
Proving a conjecture
Apr 2019
Harriss and other spirals
Mar 2019
realhats
Jan 2019
Christmas (2018) is over
2018
▼ show ▼
▲ hide ▲
Dec 2018
Christmas cross stitch
MENACE in fiction
Christmas card 2018
Nov 2018
Christmas (2018) is coming!
Sep 2018
Runge's Phenomenon
Jul 2018
World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
May 2018
A bad Puzzle for Today
Apr 2018
Building MENACEs for other games
Mar 2018
A 20,000-to-1 baby?
World Cup stickers 2018
Jan 2018
Origins of World War I
Christmas (2017) is over
2017
▼ show ▼
▲ hide ▲
Dec 2017
Christmas card 2017
Nov 2017
Christmas (2017) is coming!
MENACE at Manchester Science Festival
Jun 2017
Big Ben Strikes Again
Mar 2017
The end of coins of constant width
Dragon curves II
Feb 2017
The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
▼ show ▼
▲ hide ▲
Dec 2016
Christmas (2016) is over
Video game surfaces
Christmas card 2016
Nov 2016
Christmas (2016) is coming!
Oct 2016
Logical contradictions
Palindromic dates
Sep 2016
Tube map kaleidocycles
Jul 2016
Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
May 2016
Euro 2016 stickers
Mar 2016
Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
▼ show ▼
▲ hide ▲
Nov 2015
Christmas (2015) is coming!
Oct 2015
How to kick a conversion
How much will I win on the new National Lottery?
Aug 2015
How OEISbot works
MENACE
Mar 2015
Optimal Pac-Man
Tube map stellated rhombicuboctahedron
Logic bot, pt. 2
Design your own flexagon
Jan 2015
Tube map Platonic solids, pt. 3
2014
▼ show ▼
▲ hide ▲
Nov 2014
Logic bot
Sep 2014
Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
Apr 2014
Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
New machine unfriendly £1 coin
2013
▼ show ▼
▲ hide ▲
Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
▼ show ▼
▲ hide ▲
Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
final fantasy
oeis
cambridge
finite element method
live stream
dragon curves
stirling numbers
data visualisation
graphs
interpolation
craft
dates
the aperiodical
matrix of minors
numbers
fence posts
london underground
squares
guest posts
finite group
braiding
bluesky
php
people maths
plastic ratio
datasaurus dozen
inverse matrices
alphabets
crossnumbers
christmas card
captain scarlet
accuracy
dataset
probability
rust
standard deviation
asteroids
determinants
coins
reuleaux polygons
triangles
data
chalkdust magazine
menace
realhats
reddit
football
pokémon wordle
sorting
graph theory
raspberry pi
numerical analysis
polynomials
24 hour maths
kenilworth
simultaneous equations
folding tube maps
royal institution
anscombe's quartet
bubble bobble
national lottery
sobolev spaces
video games
books
python
tmip
logic
pizza cutting
palindromes
noughts and crosses
correlation
mean
javascript
talking maths in public
thirteen
zines
nonograms
arithmetic
speed
latex
stickers
quadrilaterals
map projections
approximation
wordle
martin gardner
tennis
pascal's triangle
logo
estimation
golden ratio
mathsjam
flexagons
curvature
crochet
binary
ucl
sport
fractals
logs
go
propositional calculus
tetris
rugby
advent calendar
newcastle
hannah fry
cross stitch
hyperbolic surfaces
geogebra
coventry
mathslogicbot
pi
statistics
sound
trigonometry
platonic solids
big internet math-off
bodmas
gather town
boundary element methods
christmas
misleading statistics
nine men's morris
games
world cup
phd
london
wave scattering
turtles
databet
regular expressions
wool
hats
royal baby
pokémon
countdown
folding paper
kings
mathsteroids
convergence
frobel
hexapawn
crosswords
friendly squares
puzzles
electromagnetic field
signorini conditions
recursion
warwick
matrix multiplication
matrices
gaussian elimination
fonts
pac-man
ternary
chess
weather station
crossnumber
rhombicuboctahedron
golden spiral
pythagoras
harriss spiral
radio 4
edinburgh
computational complexity
error bars
exponential growth
a gamut of games
dinosaurs
inline code
gerry anderson
matrix of cofactors
runge's phenomenon
geometry
programming
european cup
chebyshev
errors
manchester
arrangement puzzles
light
manchester science festival
news
machine learning
bots
partridge puzzle
youtube
bempp
draughts
pi approximation day
weak imposition
matt parker
preconditioning
game show probability
game of life
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on /blog/121