Equation 5 · Part 2 · Reactor Phylogenetics: The Family Tree of Fission Power
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 cumulative past adoptions and a, b are small initial weights representing early, largely arbitrary advantages [ 2 ] . Once pulls ahead by chance or by an unrelated advantage — a submarine program’s development budget, say — the process is self-reinforcing regardless of whether A is the objectively superior technology, and it can lock in permanently long before the alternative gets a fair trial. That is Cowan’s finding about light water stated in the exact mathematical language Arthur built for the general phenomenon, not a loose parallel drawn after the fact [ 1 ] [ 2 ] .
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
- [2] Competing Technologies, Increasing Returns, and Lock-In by Historical Events ↗
- [1] Nuclear Power Reactors: A Study in Technological Lock-in ↗
These citations provide research context; check each source for the exact claim it supports.