Polyhex (mathematics)

Polyhex (mathematics)

In recreational mathematics, a polyhex is a polyform with a regular hexagon (or 'hex' for short) as the base form.

As with polyominoes, polyhexes may be enumerated as "free" polyhexes (where rotations and reflections count as the same shape), "fixed" polyhexes (where different orientations count as distinct) and "one-sided" polyhexes (where mirror images count as distinct but rotations count as identical). They may also be distinguished according to whether they may contain holes. The number of free n-hexes for n = 1, 2, 3, … is 1, 1, 3, 7, 22, 82, 333, 1448, … OEIS|id=A000228; the number of free polyhexes with holes is given by OEIS2C|id=A038144; the number of free polyhexes without holes is given by OEIS2C|id=A018190; the number of fixed polyhexes is given by OEIS2C|id=A001207; the number of one-sided polyhexes is given by OEIS2C|id=A006535.

ee also

*Tessellation
*Percolation theory
*Polyiamond - tilings with equilateral triangles
*Polyomino - tilings with squares
*Polycyclic aromatic hydrocarbon - hydrocarbons whose structure is based on polyhexes


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