"The projective -space is in fact diffeomorphic to the submanifold of consisting of all symmetric matrices of trace 1 that are also idempotent linear transformations.[citation needed]
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In page Real projective space:
"The projective -space is in fact diffeomorphic to the submanifold of consisting of all symmetric matrices of trace 1 that are also idempotent linear transformations.[citation needed]
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