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Infinite rank for iterated winding-zero satellites
Statement
Assume full AC. Let P⊂S¹×D² be a winding-zero pattern. Assume the axis has nonzero classical Blanchfield self-pairing in the Alexander module of P(U), with the convention that the axis defines the class paired with itself. For either the locally flat topological concordance group C_top or the smooth concordance group C_sm, let Pⁿ be the n-fold composition of the induced satellite set map, with P⁰ the identity. For every n≥0, the quotient ⟨Pⁿ(C)⟩/⟨Pⁿ⁺¹(C)⟩ has infinite rank, where ⟨S⟩ denotes the subgroup generated by S and rank means dim_Q(A⊗_Z Q) for an abelian group A. For n≥1, Pⁿ is not a group homomorphism under the same hypotheses. No pairwise-coprime Alexander-polynomial assumption is part of these Theorems A and B.
Statement references
Facts & Assumptions
Given: Full AC, the winding-zero pattern and its nonzero classical axis self-value, the smooth and locally flat concordance conventions, and .
Full AC is the chosen integral half-solution and analytic convention; it implies the countable-choice hypotheses of the smooth concordance constructions. The Axiom of Choice, Integral half-solutions, Strebel classes, and L²-signatures
The actual exterior-to-zero-surgery comparison preserves the integral classical Alexander module and its Blanchfield self-values. Zero surgery identifies exterior classical Alexander and Blanchfield data
In the smooth category, actual integral solution sets are nested subgroups, satellite maps preserve concordance, and every next-iterate image lies in the corresponding integral filtration subgroup plus the cyclic class of the iterate of the unknot. The full proof supplies integral0-solutions, an actual annulus tube with zero boundary framings, homology cobordisms and deep-axis infection solutions. Smooth integral filtrations and deep-axis infection
The full finite-prime smooth obstruction theorem excludes every nonzero signed sum of each chosen finite family of iterates from integral -solvability for , and supplies a separate actual smooth nonslice nonhomomorphism witness. The finite-cyclic half-solution theorem supplies the actual obstruction. Finite-prime smooth infection obstructions use actual coefficients, Finite cyclic extensions over integral half-solutions have zero defect
The complete smooth all-iterate theorem assembles [F2]–[F3], including finite-cyclic connected-sum additivity, the case, rational independence modulo integral filtrations, the at-most-one cyclic rank loss and the separate nonhomomorphism conclusion. Smooth winding-zero iterates have infinite rank in every successive quotient
For supplied initial TOP integral-pair data and the actual finite standard pieces, the Blanchfield-bordism and full-forest meridian calculations hold. Actual finite-projective TOP duality/gluing and the lifted-half-pair vanishing theorem also hold, without smoothing that initial manifold. Integral-pair persistence and Blanchfield bordism for iterated infection, Topological finite-projective L2 duality and whole-component boundary gluing, Topological lifted half-pairs force amenable signature defect zero
External TOP geometric input under CLAUDE.md §12: locally flat concordance classes form the oriented connected-sum group; a locally flat slice disk has a collared normal product whose exterior is an integral homology circle, with prescribed meridian and zero-longitude surgery boundary. The TOP integral solution sets , defined by the same finite lifted intersection-pair conditions but allowing collared TOP four-manifolds, are nested subgroups. For winding zero, These geometric TOP assertions are imported from Cha–Kim, §1 topological convention, §3 following Theorem3.1 and Lemma3.2, Lemma4.3, and §5.1. They are not presented as locally reconstructed normal-tube or integral-filtration constructions. Full AC is retained.
The finite-stage selection and signed domination argument applies to supplied TOP initial bounds: its actual coefficient maps are supplied by [F5], and its boundary defects agree with the independent smooth invariants by the explicit external closed TOP equality in the rho-independence lemma. Higher-order rho bounds and coprime separation, Bordism independence of the L²-signature defect, Cheeger–Gromov uniform bound for rho invariants
An actual TOP integral half-solution with its canonical meridian map to has zero finite-cyclic bounding defect. The exterior/surgery comparison and canonical finite-cyclic signature means use the admitted finite prime signature families. TOP-versus-smooth boundary comparison is supplied by [F6], not assumed in the finite-cyclic theorem. Finite cyclic extensions over integral half-solutions have zero defect, Finite prime families admit explicit separating knot signature bumps, Canonical finite cyclic knot signature defects equal Seifert signature averages
Proof
Given: The complete rich Statement, with full AC as above.
In the smooth category [F1] identifies the stipulated nonzero classical axis self-value with exactly the integral surgery self-value used in [F4]. The winding and orientation conventions are the same, and AC verifies its actual geometric and analytic hypotheses. Apply [F4] to obtain infinite rational rank of for every , including its separate finite-cyclic proof at . Its finite families are chosen for each desired rank bound, so no assertion of a single explicit infinite independent sequence is needed. This establishes the entire smooth rank branch of the original Statement.
Work in the TOP group of [F8]. Fix and any desired finite rank . Choose the finite family in [F6] for size . If a nonzero signed sum of its iterates belonged to , its defining TOP solution would have exactly the integral height- pairs and isotropic height- lifts needed by [F5]. The finite forest quotient maps in [F5] have amenable target in the specified class, with top meridian of infinite order. The accepted TOP half-pair theorem gives zero defect of that actual solution; the smooth standard joining/infection pieces have zero defect as well. Whole-component additivity makes the actual boundary defect sum zero. But [F6] evaluates its bottom terms by canonical cyclic numbers and gives strict signed domination over all pattern terms. This is a contradiction. Thus these classes are rationally independent modulo : a rational relation clears denominators to the excluded nonzero signed integer relation.
At , take any finite family of the signature bumps in [F7], with distinct selected primes. For a nonzero signed sum choose an index with nonzero coefficient and evaluate the canonical cyclic defect at that prime. All cross-prime terms vanish, so the value is the selected nonzero integer coefficient times its positive normalized mean. It cannot vanish. A TOP integral1-solution would give an integral half-solution at height0 and force the same defect to vanish by [F7] and [F6]. These classes are therefore independent modulo . Since , the same at-most-one rank loss proves infinite rank of .
For , [F4] also gives a knot for which is not smoothly slice. A homomorphism on smooth concordance would make this class zero, contradicting the actual witness. Thus the entire smooth nonhomomorphism branch follows as well. Neither [F4]'s rank proof nor this witness uses a pairwise-coprime Alexander-polynomial condition, so the original A/B scope is retained.
By [F8], lies in . Quotienting a rational vector space by the span of one element loses at most one dimension. Step 1.2 therefore gives rank at least for the image of modulo that larger subgroup, hence also for its quotient by . Since was arbitrary, the rank is infinite. This uses finite families of each requested size, not an unproved explicit infinite sequence.
For , choose the three-branch companion in [F6] with normalized positive cyclic defect exceeding . If were TOP slice, [F8] would give an actual collared TOP homology-circle disk exterior. This is the zero-pair case of [F5], and its three-branch quotient kills the distinguished negative bottom restriction while at least one positive bottom restriction has the required cyclic order. The actual half-pair zero defect and piecewise gluing force total defect zero, while [F6] gives a strictly positive bottom sum exceeding all pattern terms. This contradiction proves the TOP nonhomomorphism witness. Steps1.1–2.1 already supplied the smooth conclusions. No coprime Alexander hypothesis was used. The full original Statement follows, with precisely the TOP geometric foundations and closed TOP equality declared external.
Depends on
- Localized Blanchfield pairings and higher-order rho-invariants
- Exotic and localized homology concordance classes
- Satellite operators on concordance classes
- Higher-order rho bounds and coprime separation
- Integral-pair persistence and Blanchfield bordism for iterated infection
- Amenable-signature vanishing for integral solvable bordisms
- The Axiom of Choice
- Integral half-solutions, Strebel classes, and L²-signatures
- Finite prime families admit explicit separating knot signature bumps
- Bordism independence of the L²-signature defect
- Canonical finite cyclic knot signature defects equal Seifert signature averages
- Cheeger–Gromov uniform bound for rho invariants
- Topological finite-projective L2 duality and whole-component boundary gluing
Used by
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Sources
- Jae Choon Cha and Taehee Kim, “Iterated satellite operators on the knot concordance group” (standard reference, not scraped)