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The Information Selection Problem
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What Remembering Means
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Documents, Identity, and Provenance
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Building an Inverted Index
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BM25: Ranking with Terms
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The First Search Baseline
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Parsing, Chunking, and Retrieval Units
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Dense Retrieval without Re-teaching Embeddings
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Exact Search, ANN, and Index Choice
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Filters, Scope, and Freshness
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From Similarity to Search
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Semantic Failure Analysis and Hard Negatives
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Candidate Generation as a Pipeline
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Hybrid Search and Reciprocal Rank Fusion
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Retrieval From First Principles
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Learned Sparse and Multi-Vector Retrieval
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Rerankers and Cross-Encoders
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Bring Back Only What You Need
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Context Is a Bottleneck
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Diversity, Coverage, and Evidence Budgets
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Understanding Queries and Routing
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Search, Memory and Long Context
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Query Rewriting and Expansion
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Decomposition and Multi-Hop Retrieval
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Hierarchical and Parent-Child Retrieval
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Graph and Structured Retrieval
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Decisions Cannot Read Everything
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Bounded Adaptive Retrieval: When to Stop
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Embeddings as Candidate Generation
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Relevance Judgments and Test Collections
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Retrieval Is Not Geometry
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Metrics that Answer Different Questions
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Controlled Experiments and Regression Gates
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Latency, Cost, and Operational Reliability
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Does Better Retrieval Improve the Task?
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The Reference Retrieval Contract
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Defending the Retrieval Boundary
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Improve and Writer: A Real Retrieval Workflow
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What We Can Now Prove
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RELATE: Searching Embeddings by Relation, Not Just Similarity