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Article
Open AccessThe Classification of Surfaces via Normal Curves
We present a simple proof of the surface classification theorem using normal curves. This proof is analogous to Kneser’s and Milnor’s proof of the existence and uniqueness of the prime decomposition of 3-manif...
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Article
Open AccessA Boothby–Wang Theorem for Besse Contact Manifolds
A Reeb flow on a contact manifold is called Besse if all its orbits are periodic, possibly with different periods. We characterize contact manifolds whose Reeb flows are Besse as principal
