umbilical point 中文意思是什麼
umbilical point
解釋
臍點-
As a result, ( i ) let k ( x ) be the function assign to each point x of m the infinimum of the sectional curvatures of m at that ponit, if k ( x ) satisfies, then m is totally umbilical. ( ii ) let q ( x ) be the function assign to each point x of m the infinimum of the ricci curvatures of m at that ponit, if q ( x ) satisfies q > 1 / 4 ( n - 2 ) ( c + 4h2 ) - 1 / 4nc, then m is totally umbilical, ( iii ) let a be the square length of the second fundermental form, if satisfies, then m is totally umbilical
) )中具有非零平行法平均曲率向量的緊致全實偽臍子流形m ~ n ,得到了( ? )如果m ~ n在其點x的截面曲率的下確界函數k ( x )滿足條件:則m ~ n是全臍的( ? )如果m ~ n在其點x的ricci曲率的下確界函數q ( x )滿足條件:則m ~ n是全臍的。 ( ? )如果m在m中的第二基本形式h長度的平方滿足條件:則m ~ n是全臍的。
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