Galvagni Figures and Reid Figures for Enneiamonds

An enneiamond is a figure made of nine equilateral triangles joined edge to edge. 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

Here are the known minimal Galvagni figures for enneiamonds:

Unsolved

Impossible

Hypersymmetric Variants

Reid Figures

And here are the minimal known Reid figures:

Unsolved

Impossible

Hypersymmetric Variants

Last revised 2010-09-30.

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Col. George Sicherman [ HOME | MAIL ]