Geodesic
Positive projections as generators of $J$-projections of type~(B)
Lobachevskii journal of mathematics, Tome 26 (2007), pp. 91-105.

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Let $\mathcal A$ be a von Neumann $J$-algebra of type (B) acting in an indefinite metric space. The aim of the paper is to study $J$-projections from $\mathcal A$.
Keywords: quantum logic, Hilbert space, indefinite metric space, projection. 
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M. S. Matveichuk; A. M. Ionova. Positive projections as generators of $J$-projections of type~(B). Lobachevskii journal of mathematics, Tome 26 (2007), pp. 91-105. http://geodesic.mathdoc.fr/item/LJM_2007_26_a9/

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