Project supported by the National Center for R & D on Superconductivity of China.
Since the discovery of high T_c oxide superconductor, scientists and engineers aredeeply concerned with the possibility of its application to the electric machine withstrong operating current at high magnetic fields. ...
In this note, we will obtain the following two results:(1) Suppose W is a k-connected closed n-manifold (if k=0, W is orientable). Let M=(?), 0≤h≤2k and n-2h≥5. Then any immersion of M into R2n-h-1 can be ext...