Galvagni Figures for Didrafters
A didrafter is made by joining two 30°-60°-90°
triangles along equal edges, where the halves of a triangle's hypotenuse
may be used separately.
A didrafter is proper
if it can be placed on a polyiamond grid
so all its edges lie on the edges and medians of the grid cells.
Otherwise it is improper
A Galvagni Figure for a polydrafter is a polydrafter that can be
tiled with the given polydrafter in more than one way.
Here are some minimal Galvagni Figures
for proper and extended didrafters.
These figures are not polydrafters, but they can be tiled
by didrafters in more than one way:
Last revised 2017-04-25.
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