Xidian University 三、散度(divergence) ∂ V.= AevD te):-6+ 三 0vg大0y 8x 00型十02 Geometrical Interpretation: A point of positive divergence is a source A point of negative divergence is a sink,or "drain" 西安电子科技大学西安电子科技大学 三、散度 （divergence） Geometrical Interpretation: A point of positive divergence is a source A point of negative divergence is a sink, or “drain