Phyllotaxis
the spirals are counted, not admired
Concept

Onset — where it appears

The organ from which a damage profile holds its levels for the rest of the run, dividing the disturbance healing from the pattern repeating. It is a reading rather than an event, and one defined as a first index satisfying a condition returns a number whether or not the condition ever holds.

Named by 2 essays across one field — each of them below, with the objects they name alongside it.

Which cuts count as periodic, at each reading window. One row per wrecked cut and one column per window. A filled cell is a cut whose worst class spread is under the ten-degree line and is therefore called periodic. At 60 organs 28 of the 30 cuts are, at 120 organs 25, and at 180 organs 25. three rows change side, all of them losing their periodicity as the window widens, and they are marked.

The window nobody moved

Three instrument settings sit between the ablation census and every statement it makes. Two have been varied and both decided answers. The third is a hundred and twenty organs at the top of a run, it has never been moved, and moving it changes the verdict on three rows.

mechanism · two windows Where each window begins, against where the pattern begins. The run is drawn left to right, one bar per cut. The pale stretch is the disturbance still healing, up to the organ from which the profile holds its levels for the rest of the run; the dark stretch is the pattern repeating. The marks are the organ each of the three windows starts at, since a window is the last N organs of a run. On these rows the widest window starts inside the pale stretch, so it is reading the healing and calling it the pattern — which is why widening the window takes them off the periodic list.

Three rows a window moves

Three of the census's thirty cuts are periodic when a hundred and twenty organs are read and not when a hundred and eighty are. Their spreads do not grow in proportion to the window, they grow by twenty and forty times, and the reason is that a window is the tail of a run.

mechanism · two windows

Named alongside it

The objects these essays reach for when they reach for this one.

ArtefactClaim testingDamage profileHonest limitsInstrument settingMeasurement errorPeriodicityReading windowResidue classAblationResolutionRun length

All concepts