Six-armed cell

We give the name six-armed cell to the cell that is homeomorphic to a unit cell of the P minimal surface. If the length s of this six-armed cell is equal to the full period of the function f y) (or any integral multiple of it), then the six-armed cell is also a unit cell and h = s. If in addition f(y) possesses mirror symmetry about the plane y = bjl, i.e., f y) = f(b y), then this is a... 

With / identically zero, s was varied from 0.98 to 1.04, to investigate expansions of the area and volume fractions in s about s = 1. Strictly speaking, there is a (removable) singularity in the curve of area of a unit cell at s = 1 because of the change in symmetry from tetragonal to cubic (when / is constant), so we choose to report the area of a six-armed cell. It was found that to whithin 0.5%, the value of remained constant at the value... 

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