Orbifold adjunction formula and symplectic cobordisms between lens spaces.
Orbit-cone correspondence for the proalgebraic completion of normal toric varieties
We prove that there is an orbit-cone correspondence for the proalgebraic completion of normal toric varieties, which is analogous to the classical orbit-cone correspondence for toric varieties.
Orientability of higher order Grassmannians
Orientation Reversing Morse-Smale Diffeomorphisms of S2.
Orientation-reversing homeomorphisms in surface geography.
Orthogonal polynomials represented by CW-spheres.
Orthogonal random vectors and the Hurwitz-Radon-Eckmann theorem.
Orthogonal representations of Galois groups, Stiefel-Whitney classes and Hasse-Witt invariants.
Outer automorphism groups of Bieberbach groups.
Overtwisted open books from sobering arcs.
Ozsváth-Szabó invariants and tight contact three-manifolds; I.