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In [[mathematics]], the '''[[classifying space]] for [[unitary group|U(''n'')]]''' may be constructed as either
# the [[Grassmannian]] of ''n''-planes in an infinite-dimensional complex [[Hilbert space]]; or,
# the direct limit, with the induced topology, of [[Grassmannian|Grassmannians]]s of ''n'' planes.
Both constructions are detailed here.