Galvagni Figures & Reid Figures for Polycairos
A cairo is a pentagon with at least four sides equal
and forming two nonconsecutive right angles.
A polycairo is a plane figure formed by joining cairos edge to edge
on the polycairo grid.
A Galvagni figure is a figure that can be tiled by a polyform
in more than one way—a kind of self-compatibility figure.
A Reid figure is a Galvagni figure without holes.
Galvagni figures and Reid figures first appeared in Erich Friedman's
for November 2004.
Here are minimal known Galvagni figures for polycairos.
Last revised 2013-10-15.
Back to Galvagni Compatibility
Col. George Sicherman