MATHLIBANNEX / PROJECT LFH

Direct sums of GNS representations and shell unitaries

Let denote pure-GNS equivalence classes and the root-preserving selected data. Distinct classes, not merely distinct state functionals, give inequivalent representations. Their direct sum is on . Write and .

The generic atomic-shell theorem takes the rank-one limiting defects as hypotheses. The pure-GNS specialization discharges irreducibility, inequivalence and normalization, while retaining the shell hypotheses. The separate CAR realization proves the required residual-line identities. It chooses unitary links once. The generic generated algebra permits arbitrary bounded extra operators and does not itself assert the CAR consequences.

Exact Card references

Boundary Inputs

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Exact source and provider boundary · Earlier 466-declaration Project view and PDF

Dependency-first reading route

Levels belong to this reading scope. Follow prerequisites or uses to focus the route.

7 declarations

Level 0

Level 0Focus target

The selected GNS representation of a pure-state class

MathlibAnnex.CStarAlgebra.PureState.selectedRepresentation

A choice of representative pure states, fixed literally at a root, gives one concrete GNS representation per equivalence class.

Immediate prerequisites in this Project
None in this scope

Used by in this Project
Distinct GNS classes have no unitary intertwiner, The atomic direct sum of the selected CAR representations

Level 0Focus target

The closed operator algebra generated by a representation and extra operators

MathlibAnnex.CStarAlgebra.AtomicConstruction.concreteTarget

Places a represented algebra and a chosen family of bounded operators in one concrete closed algebra.

Immediate prerequisites in this Project
None in this scope

Used by in this Project
An irreducible operator algebra constructed from projection shells

Level 1

Level 1Focus target

Distinct GNS classes have no unitary intertwiner

MathlibAnnex.CStarAlgebra.PureState.no_unitaryIntertwiner_selectedRepresentation

The class index makes the selected pure-GNS family pairwise unitarily inequivalent.

Level 1Focus target

The atomic direct sum of the selected CAR representations

MathlibAnnex.CStarAlgebra.CAR.selectedAtomicRepresentation

All selected pure-GNS fibers of the completed CAR algebra act together on one Hilbert direct sum.

Level 1Focus target

An irreducible operator algebra constructed from projection shells

MathlibAnnex.CStarAlgebra.AtomicConstruction.exists_irreducible_atomicShellModel

Shell partial isometries with rank-one limiting defects can be completed to unitary links that join inequivalent irreducible fibers.

Level 2

Level 2Focus target

The atomic-shell construction on selected pure-GNS fibers

MathlibAnnex.CStarAlgebra.AtomicConstruction.exists_irreducible_pureAtomicShellModel

Pure-state GNS data supplies the irreducible and inequivalent fibers required by the generic shell construction.

Level 3

Level 3Focus target

Realizing a shell family by a faithful irreducible operator algebra

MathlibAnnex.CStarAlgebra.CAR.exists_completedAtomicShellModel

Constructs unitary links between pure-state summands and an irreducible algebra containing a faithful copy of CAR.

Immediate prerequisites in this Project
The atomic direct sum of the selected CAR representations, The atomic-shell construction on selected pure-GNS fibers

Used by in this Project
None in this scope

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