Body-Pin Rigidity

9.3. Deviations register🔗

Where a mapped result is proved or represented by a different route, the divergence is recorded in a register, lt-source-deviations.toml, whose entries are fingerprinted against the witness they excuse: re-transcribing a witness expires its entries, so the register cannot silently outlive the text it reviews. The register holds twenty-two entries. Each row below compresses one entry to a sentence; the chapter name links to the node whose witness the entry excuses, where both sides are stated in full.

Paper

Chapter

The difference

§1, A.1

Statement

Pins are occurrences with two endpoint maps, so parallel pins stay distinct, and partitions are surjections onto [t]

(1.2)

Statement

A second, ordered capacity convention with bound 12(t-1) is defined alongside the paper's unordered one and never used in the main theorem

§1 (Asimow-Roth)

Statement

The cited rank formula is replaced by comparison with the complete graph, and the paper's generic by an open dense set of placements

§1 (Asimow-Roth, regular locus)

Statement

The regular placements are proved open and dense and their complement is not proved Lebesgue-null, and generic is read as simultaneous regularity rather than as algebraic independence of coordinates

§6.4 (necessity)

Necessity

Proved directly rather than by contraposition: no flex is constructed, and grounding fixes one block's twist to zero

§2.1 (addable-edge criterion)

Sparsity

Proved from the induced-edge count alone; supermodularity is never invoked

Lem 2.1, 3.7, 3.8

Sparsity

A 2,811-line construction theorem for (2,2)-tight graphs sits beside them with no paper counterpart, and is not what they rest on

(2.1)-(2.3)

Deletion

Exactness of (2.3) is never asserted; the block-kernel dimension formula is proved directly and gives s = t + u

(2.4)-(2.6)

Deletion

The defect \Delta is not a named quantity anywhere; the inequality \Delta \le 0 appears only as the flagged semismallness budget

§2.2 (certified response edge)

Deletion

The augmentation lemma asks only that the edge be absent and its row in the row space; sparsity of H + xy is a hypothesis of each use, discharged there by the addable-edge lemma

Def 3.1

Flags

Renamed throughout; no standalone one-flag object, and the ghost vertex is the flag index itself

Def 3.2

Flags

Exact types for live vertices and active flags; the completion is an edge set on V \oplus \Gamma, and the variety X_{\mathcal{T}} has no counterpart

Prop 3.3

Flags

Counting halves only: the incidence graph B_{\mathcal{T}} is never constructed, and the geometric half has no counterpart

Thm 1.2

Flags

Never stated standalone; the sole self-stress hypothesis of the assembly theorem is a grounded form over \Q, derived by adjoining three translation variables

Prop 3.3, Prop 6.5

Flags

A rendering convention: the release line has no proposition directive, so the paper's propositions render as lemmas with the word Proposition in the title

§4, Thm 4.2

Strata

Expository: the scheme statements have no Lean counterpart, and Theorem 1.1 does not depend on them

(1.6)/(5.2)

Split–Klein

Two builds of I_F; the load-bearing one is grounded, over \Q, indexed by selected pin occurrences, with the distinct locus as a denominator

Thm 1.3

Split–Klein

Proved for a grounded ideal over \mathbb{Q} indexed by pin occurrences, with the distinct locus a denominator rather than an open set

Cor 5.4

Split–Klein

Neither the ungrounded variety nor the product decomposition has a counterpart; the formalization is grounded from the ring onward

Lem 6.3

Body–pin

No matroid API: the sparse subgraph comes from a maximum sparse subset and the tight-hull partition, with only the constructive half of the min-max load bearing

Lem 6.4

Body–pin

No statement of the lemma's shape exists; a homogeneous prime avoiding a positive-degree denominator drops height, which replaces the orbit argument

§6.4 (sufficiency)

Body–pin

No complex-to-real specialization occurs: the certificates are integer polynomials from the start, and the compatibility-matrix minor f has no counterpart