Equation 20 · Part 1 · Naive, Graph, and Agentic: A Systems Comparison of RAG Architectures
Symbol C_index
What this part means
the writing.
Its job in the formula
ndex is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol C_index→Article meaning
Where the article explains it
Writing for the one-time cost of building the graph and its community summaries, and for the cost of answering a single query against the finished structure, the amortised cost of a query workload of size Q against one graph is = + .
The passage around this formula
When Q is small — a corpus queried rarely, or one still being explored — dominates and the naive or hybrid architectures are cheaper by a wide margin, because they pay nothing until a query arrives. When Q is large against a stable corpus, the fixed term is driven down toward zero and the comparison turns on against the per-query…
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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the surrounding passage
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