Why can total participation of an entity type in a relationship type also be referred to as existence

QUESTION:

Why can total participation of an entity type in a relationship type also be referred to as the existence dependency of that entity type in that relationship type?

ANSWER:

Total participation occurs if, in order to exist, an entity type must participate in the relationship. Thus, the total participation of an entity type in a relationship type can be termed existence dependency of that entity type in that relationship type.

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