Steven H. Cullinane (scullinane@acm.org)

Elderly, retired, finite-geometry enthusiast.

Personal journal 
Mathematics website 
ORCID bio page 
Google Scholar 
Mathematics image gallery 
Academia.edu 
Harvard Dataverse 
Harvard DASH article on PG(3,2) 
GitHub 
Internet Archive: Notes on Groups and Geometry 
Encyclopedia of Mathematics 
The Diamond Theorem and Truchet Tiles 
Cullinane in a 2020 Royal Holloway Ph.D. thesis 
Squares, Chevrons, Pinwheels, and Bach 
Diamond-theorem art by Josefine Lyche 
Portfoliobox 
Substack 
Symmetry Summary 
Association for Computing Machinery