The Statigraphy of Intelligence
The common graphic implies: AI ⊃ ML ⊃ DL → GenAI → RAG → Agents, as if they were the same type.
They are not.
AI is the research program (Dartmouth, 1956). ML / DL / GenAI are method families within it.
RAG and Agents are not types of AI — they are architectural patterns:
Retriever (1940s: file cabinets, Hollerith cards) + Generator (2017) + Controller.
Informatics vs File Cabinets vs Typewriters vs Email.
You can't leave out the file cabinet — the vector DB is the file cabinet.
A real system is not a step on a ladder. It is a coordinate in S × C × A.
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