What's the difference in notation for total participation and recursive relation?

Question

Does the double line in the following ER diagrams means total participation or recursive relation?

Answer 1

double line : Used to represent total participation of an entity in a relationship set.

A recursive relationship is one in which the same entity participates more than once in the relationship.

recursive relationship example : Suppose one team is assigned the task of supervising the other teams. This supervisor team makes sure that each team records its portion of the data. The supervision relationship is a recursive relationship because the same entity, a particular team, participates more than once in the relationship, as a supervisor and as a supervisee. To draw the situation, we label the two lines between team and supervision with the two possible roles

by this definitions all three above are total participation