THE STATE-SPACE OF THE LATTICE OF ORTHOGONALLY CLOSED SUBSPACES
Glasgow mathematical journal, Tome 47 (2005) no. 1, pp. 213-220

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The notion of a strongly dense inner product space is introduced and it is shown that, for such an incomplete space $S$ (in particular, for each incomplete hyperplane of a Hilbert space), the system $F(S)$ of all orthogonally closed subspaces of $S$ is not stateless, and the state-space of $F(S)$ is affinely homeomorphic to the face consisting of the free states on the projection lattice corresponding to the completion of $S$. The homeomorphism is determined by the extension of the states. In particular, when $S$ is complex, the state-space of $F(S)$ is affinely homeomorphic to the state-space of the Calkin algebra associated with $\skew3\overline S$.
DOI : 10.1017/S0017089504002174
Mots-clés : Primary 46C05, 46L30, Secondary 03G12
CHETCUTI, E.; DVUREČENSKIJ, A. THE STATE-SPACE OF THE LATTICE OF ORTHOGONALLY CLOSED SUBSPACES. Glasgow mathematical journal, Tome 47 (2005) no. 1, pp. 213-220. doi: 10.1017/S0017089504002174
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