Read the text and determine if the sentence is true (see options at the end):

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.

Sentence: The word "if" does not appear in the context.
Possible answers:
(1). Yes
(2). It's impossible to say
(3). No
(3).