Equation 7 · Part 1 · RAG in 2035: Four Scenarios, Their Signals, and What Would Falsify Them
Symbol M
What this part means
the number of tokens.
Its job in the formula
M 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 M→Article meaning
Where the article explains it
Pasting a whole corpus of size M into context puts a floor under n near M itself; retrieving costs roughly the price of an index lookup plus the price of reasoning over the k M tokens actually returned: = , = O( M) + , k M.
The passage around this formula
As a corpus grows, the two costs diverge regardless of how cheap or how large any single model’s window becomes, because M keeps growing too. This is the economic argument for why explicit retrieval persists even in scenarios where verifiability is weak: corpus growth, not just model quality, keeps a bounded fetch cheaper than a full paste. It says nothing about whether that fetch is checkable, which is exactly why Axis B has to be argued separately rather than assumed to follow from Axis A.
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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Sources cited in the article section
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