Equation 15 · Part 1 · Retrieval Is an Evidence System, Not a Memory
Symbol k
What this part means
k 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
k 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 k→Article meaning
The passage around this formula
Read together, these say something specific about the top- k parameter. Increasing k raises the probability that the answer is present and simultaneously raises the volume of distractors and the chance that the answer sits mid-block. Recall and usability move in opposite directions, so k has an interior optimum that must be measured rather than assumed, and the optimum is corpus-specific.
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.
Open the illustrated variables: a letter stands for a value guide →
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Sources cited in the article section
- [11] Lost in the Middle: How Language Models Use Long Contexts ↗
- [12] Large Language Models Can Be Easily Distracted by Irrelevant Context ↗
- [18] Benchmarking Large Language Models in Retrieval-Augmented Generation ↗
These citations provide research context; check each source for the exact claim it supports.