Galvagni Figures for Trifetts
A trifett is a plane figure formed by
joining three equal isosceles right triangles at equal edges
or at vertices on the quadrille 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.
first appeared in Erich Friedman's
for November 2004.
Here are minimal known Galvagni figures for the 90 trifetts.
Some polyaboloes have solutions that are technically Galvagni
figures but are not polyaboloes.
They are formed by joining parallelograms to make voided rhombuses.
Last revised 2020-09-21.
Back to Galvagni Compatibility
Col. George Sicherman