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- W4309261722 abstract "Local actions of [Formula: see text], the group of finite permutations on [Formula: see text], on quasi-local algebras are defined and proved to be [Formula: see text]-abelian. It turns out that invariant states under local actions are automatically even, and extreme invariant states are strongly clustering. Tail algebras of invariant states are shown to obey a form of the Hewitt and Savage theorem, in that they coincide with the fixed-point von Neumann algebra. Infinite graded tensor products of [Formula: see text]-algebras, which include the CAR algebra, are then addressed as particular examples of quasi-local algebras acted upon [Formula: see text] in a natural way. Extreme invariant states are characterized as infinite products of a single even state, and a de Finetti theorem is established. Finally, infinite products of factorial even states are shown to be factorial by applying a twisted version of the tensor product commutation theorem, which is also derived here." @default.
- W4309261722 created "2022-11-25" @default.
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- W4309261722 date "2022-12-19" @default.
- W4309261722 modified "2023-09-25" @default.
- W4309261722 title "De Finetti-type theorems on quasi-local algebras and infinite Fermi tensor products" @default.
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- W4309261722 doi "https://doi.org/10.1142/s021902572250028x" @default.
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