This index points to explanations and worked calculations rather than to isolated mentions. Notebook links use the same local anchors as the book.
Aggregation and counting: Unique backgrounds; equal supported cells; incremental counts and sums.
Alignment: Anchor fit and held-out row; constraints and rank.
Attention: Allocation; source denominators; topic ranking.
Calculus and fitting: Difference quotient, derivative, and ridge minimum; logistic gradient step.
Covariance and variance: Paired-deviation table; people covariance entry; retained variance.
Eigenvectors: Two-coordinate multiplication and maximum variance; people basis.
Evidence: Identity, association, and claim chain; dated Dean journey and event examples.
Geometry: Coordinate versus directional neighbors; compression effects.
Matrices: Product and transpose by hand; notation and shapes.
Normalization and standardization: Length and unit rows; A’s exact normalization; different denominators.
Ontology and probability: Tags, crosswalks, and proposed models; logistic and calibration; person-level substitution.
Projection and residual: First residual; exact round trip; SVD reconstruction.
Rotation and whitening: Rotated covariance arithmetic; article coordinates.
Scores and loadings: Both person dot products; one loading table, two entrances.
Time and version: Fixed ruler and separate clocks; background-only updates.