Tetraming Oddities

A tetraming is a plane figure formed by joining four cells in the equilateral triangular grid along edges or at corners or both. There are 72 tetramings, independent of reflection.

An oddity is a figure with binary symmetry formed by an odd number of copies of a polyform. Here are the minimal known tetraming oddities with various symmetries. Please write if you find a smaller solution or solve an unsolved case.

Horizontal Mirror Symmetry

Vertical Mirror Symmetry

2-Rotary Symmetry On Vertex

2-Rotary Symmetry On Edge

Horizontal and Vertical Symmetry On Vertex

Horizontal and Vertical Symmetry On Edge

6-Rotary Symmetry

Full Symmetry

Last revised 2019-11-10.

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Col. George Sicherman [ HOME | MAIL ]