Equation 7 · Part 2 · The Type Chart Is a Payoff Matrix, and the Metagame Only Half-Solves It
Symbol i
What this part means
i is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.
Its job in the formula
i is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.
Full expression→Symbol i→Article meaning
The passage around this formula
…E into a genuine zero-sum payoff by taking a log-ratio: U(i,j) = \!E(i,j)/E(j,i) , which is antisymmetric by construction ( U(i,j) = -U(j,i) ) and reads in doublings of relative advantage — U(i,j)=2 means i ’s best attack into j outclasses j ’s best attack into i by a factor of four. This is a standard move in evolutionary game theory, and this piece does not pretend to invent the tool: this house has already used replicator dynamics to model real market selection and a matched null-model discipline…
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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