In mathematical representation theory, two representations of a group on topological vector spaces are called Naimark equivalent (named after Mark Naimark) if there is a closed bijective linear map between dense subspaces preserving the group action.
References
Warner, Garth (1972), Harmonic analysis on semi-simple Lie groups. I, Berlin, New York: Springer-Verlag, MR 0498999
Undergraduate Texts in Mathematics
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