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2023-12-27
Another great puzzle, Matthew, thank you!
David Walbert
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Archive
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Off-by-one errors
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24 Hour Maths Game Show
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Approximating π
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Build your own MENACE
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Happy -9+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
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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
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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
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2015
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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
gerry anderson
light
kenilworth
error bars
regular expressions
warwick
gaussian elimination
mathsjam
cross stitch
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ternary
runge's phenomenon
countdown
dataset
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noughts and crosses
realhats
data visualisation
sobolev spaces
nine men's morris
newcastle
errors
sport
rhombicuboctahedron
golden ratio
matrix multiplication
live stream
recursion
final fantasy
partridge puzzle
pi
accuracy
bodmas
signorini conditions
palindromes
harriss spiral
football
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geometry
php
craft
cambridge
alphabets
christmas
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wave scattering
london underground
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preconditioning
anscombe's quartet
chess
gather town
geogebra
matrix of minors
numbers
crochet
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simultaneous equations
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radio 4
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matrix of cofactors
pizza cutting
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wool
triangles
bluesky
sorting
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logic
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people maths
advent calendar
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stirling numbers
boundary element methods
chalkdust magazine
books
approximation
oeis
standard deviation
edinburgh
pascal's triangle
probability
pi approximation day
arrangement puzzles
pokémon
tmip
guest posts
go
logo
platonic solids
matrices
logs
interpolation
game show probability
convergence
hyperbolic surfaces
sound
misleading statistics
speed
dinosaurs
hats
manchester
royal institution
weak imposition
python
inline code
national lottery
computational complexity
hannah fry
graphs
bempp
news
phd
mean
trigonometry
exponential growth
christmas card
coventry
world cup
crossnumber
machine learning
map projections
games
plastic ratio
tetris
martin gardner
folding tube maps
crossnumbers
braiding
graph theory
pythagoras
crosswords
friendly squares
fractals
the aperiodical
puzzles
royal baby
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estimation
big internet math-off
coins
youtube
zines
menace
dates
databet
golden spiral
statistics
reddit
polynomials
quadrilaterals
weather station
24 hour maths
arithmetic
thirteen
pokémon wordle
binary
a gamut of games
numerical analysis
electromagnetic field
rust
stickers
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datasaurus dozen
european cup
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talking maths in public
frobel
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fence posts
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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 -9+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
matrices
24 hour maths
sobolev spaces
misleading statistics
sport
wave scattering
the aperiodical
logo
interpolation
electromagnetic field
tmip
estimation
radio 4
christmas
talking maths in public
crossnumbers
noughts and crosses
sorting
youtube
martin gardner
graphs
pizza cutting
approximation
binary
gerry anderson
logs
geogebra
pokémon wordle
edinburgh
crossnumber
golden spiral
statistics
asteroids
geometry
javascript
bempp
weak imposition
cambridge
hexapawn
tetris
newcastle
warwick
stickers
arrangement puzzles
graph theory
chess
pascal's triangle
hyperbolic surfaces
preconditioning
inverse matrices
rust
wordle
mean
numerical analysis
dinosaurs
plastic ratio
game of life
errors
inline code
realhats
programming
countdown
guest posts
simultaneous equations
frobel
speed
london
regular expressions
sound
manchester science festival
reddit
flexagons
bubble bobble
machine learning
oeis
finite element method
a gamut of games
raspberry pi
matrix of cofactors
latex
pythagoras
folding tube maps
mathsteroids
wool
ucl
runge's phenomenon
determinants
arithmetic
convergence
manchester
finite group
pokémon
chebyshev
games
partridge puzzle
python
propositional calculus
coventry
matt parker
ternary
anscombe's quartet
video games
bluesky
matrix multiplication
puzzles
advent calendar
draughts
pi
map projections
crosswords
braiding
reuleaux polygons
signorini conditions
standard deviation
big internet math-off
pi approximation day
probability
logic
gaussian elimination
php
news
rhombicuboctahedron
captain scarlet
menace
craft
go
polynomials
databet
friendly squares
platonic solids
folding paper
harriss spiral
crochet
books
boundary element methods
zines
quadrilaterals
computational complexity
error bars
cross stitch
royal institution
coins
london underground
nine men's morris
game show probability
curvature
numbers
bodmas
palindromes
squares
bots
dragon curves
matrix of minors
trigonometry
mathsjam
thirteen
mathslogicbot
world cup
light
data visualisation
fonts
dates
live stream
european cup
final fantasy
christmas card
pac-man
rugby
exponential growth
alphabets
weather station
fence posts
chalkdust magazine
tennis
turtles
gather town
accuracy
kenilworth
hannah fry
correlation
kings
recursion
football
people maths
national lottery
nonograms
golden ratio
dataset
hats
datasaurus dozen
royal baby
stirling numbers
data
phd
fractals
triangles
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