Polyomino Semi-Oddities
Introduction.
A polyomino semi-oddity
is a figure with four-way symmetry or better formed by an even
number of copies of a polyomino that is not a multiple of 4.
Here are the minimal known semi-oddities
for polyominoes of order up through 8.
Quaternary Rotary
Full Symmetry
Quaternary Rotary
Unsolved
Impossible
Full Symmetry
Unsolved
Impossible
Double Diagonal
Unsolved
Quaternary Rotary
Unsolved
Impossible
Full Symmetry
Unsolved
Impossible
Quaternary Rotary
Full Symmetry
Last revised 2016-06-30.
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Polyform Curiosities
Col. George Sicherman
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