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Equation 10 · Naive, Graph, and Agentic: A Systems Comparison of RAG Architectures

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Zk(x)\mathcal{Z}_k(x)

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Zk\mathcal{Z}_k

Symbol Z_k

ZkZ_k is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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xx

Symbol x

the writing.

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subscript

subscript

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.

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How to interpret it

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What the article says around this equation

with retriever parameters η\eta and generator parameters θ\theta [ 1 ] . One retrieval call, one generation pass, and the entire system’s dependence on the corpus runs through that single set Zk(x)\mathcal{Z}_k(x) .

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