Abstract
It is shown that any HNN extension is precisely a compression by a projection of a certain amalgamated free product in the framework of operator algebras. As its applications several questions for von Neumann algebras or C*-algebras arising as HNN extensions are considered.
Citation
Yoshimichi Ueda. "Remarks on HNN extensions in operator algebras." Illinois J. Math. 52 (3) 705 - 725, Fall 2008. https://doi.org/10.1215/ijm/1254143997
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