Equation 21 · Part 1 · Measuring What a RAG System Retrieves, Not Just What It Answers
Symbol P
What this part means
P is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
P 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 P→Article meaning
The passage around this formula
The reverse failure sits inside the first term. P( R) can be low even when R holds — the right evidence was retrieved and still the generator wrote an unfaithful, evasive, or contradicted answer — and a retrieval-only evaluation, which never inspects generation at all, cannot detect this. Chen and colleagues benchmarked RAG…
Learn the underlying idea
A function assigns an output to each allowed input. The expression f(x) means “apply f to x”.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.