Equation 34 · Part 1 · The Valley of Stability Is a Fitness Landscape
Symbol Z
What this part means
Z is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
Z is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol Z→Article meaning
The passage around this formula
where , , and collect the volume, surface, Coulomb, and asymmetry contributions and the pairing term shifts the curve up or down depending on whether N and Z are both even or both odd. For odd A , exactly one of N , Z is even and the pairing term vanishes, giving a single parabola with one minimum: one value of Z at that mass number is the most tightly bound, and every other isobar decays toward it by beta-minus emission (if it sits to the…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.