We prove that a closed co-oriented contact (2m + 1)-manifold (M2m+1, xi) can be a contact submanifold of the standard contact structure on R4m+1, if it satisfies one of the following conditions: (1) m is odd (m >= 3) and H-1 (M2m+1; Z) = 0, (2) m is even (m = 4) and M2m+1 is 2-connected, (3) m = 2 and M-5 is simply-connected.
机构:
Univ Tokyo, Grad Sch Math Sci, Meguro Ku, 3-8-1 Komaba, Tokyo 1538914, JapanUniv Tokyo, Grad Sch Math Sci, Meguro Ku, 3-8-1 Komaba, Tokyo 1538914, Japan