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Welcome to the Heather Cafe
About Me
CV
PhD Students
Publications
Recent posts
What happens in practice if the P=NP problem is solved?
People keep explaining the Monty Hall problem wrong
How many pieces do you really need for a calendar puzzle?
JSONLines — My Favourite Format
Making the most annoying jigsaw puzzle
Too much Discussion of the XOR swap trick
Software
Minion: A fast scalable constraint solver
GAP
Games
stacscheck: the St Andrews Computer Science CHECKer
Permutation Group Notes
Introduction
Permutations in Practice
Stabiliser Chains
Ordered Partitions
Graph Isomorphism
Intersection
Intersection by Backtracking
Search Reduction
Making it Fast
Appendix
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code
Constraint programming
data formats
GAP
Probability
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What happens in practice if the P=NP problem is solved?
Sep 9, 2026
People keep explaining the Monty Hall problem wrong
Sep 4, 2026
How many pieces do you really need for a calendar puzzle?
Apr 13, 2026
JSONLines — My Favourite Format
Apr 4, 2026
Making the most annoying jigsaw puzzle
Mar 30, 2026
Too much Discussion of the XOR swap trick
Mar 16, 2026
Wait, what is XOR?
Mar 15, 2026
GAP Internals - GASMAN
Feb 11, 2024
GAP Types and Filters
Nov 15, 2015
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Publications
What happens in practice if the P=NP problem is solved?