double headed bobbin; doubleflanged,feed-spool; flangedbobbi

Defines bordered manifold and concordantly oriented concepts of smooth or piecewise smooth bordered manifold, thus proof“general Stokes formula by n-demensional E-G formula.

进一步定义了 (广义n维 )有边流形及光滑或分片光滑有边流形与边界协调定向的概念 ,从而由n维奥—高公式推导出一般斯托克斯公式 。