Equation 15 · Part 3 · Why We Punish Strangers: The Evolution of Human Cooperation
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
which falls as the residual pool of defectors, 1 - x - y , shrinks. Once a group happens to reach a state where . punishing costs less at the margin than plain, unpunishing cooperation does, and ordinary within-group selection stops working against the punishing type in that group. If groups that reach this state also out-compete or out-reproduce groups that never do — amplified, the authors argue, by cultural transmission mechanisms such as conformist imitation of locally common strategies, which are not available to purely genetic evolution — group-level selection can carry punishment, and the large-scale cooperation it sustains, to frequencies individual selection alone…
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.