Equation 9 · Part 2 · Radioactive Clocks: How Nuclear Physics Gave Evolution Its Time
subscript
subscript
What this part means
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
Its job in the formula
A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.
Full expression→subscript→Article meaning
The passage around this formula
where and are the radiogenic lead atoms accumulated from each chain and , are the surviving parent uranium atoms. Plotting these two ratios against each other traces a curve, the concordia, on which a grain that has behaved as a closed system since crystallization must fall; a grain that has lost lead at some later date instead falls off the curve along a discordia line whose two intersections with concordia record both the original crystallization age and the age of the later disturbance [ 17 ] . This is the internal cross-check the directive of this article’s research promised: no external assumption is needed to catch a disturbed grain, because the two…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.