[Solved] A completeness constraint may specify that each entity of the supertype must be a member of some subtype in the relationship. Function: In mathematics and computer science, a specific relation or expression involving one or more inputs and a single output. Anal Stage: A phase in Freud's psychosexual development theory where pleasure is focused on the anal region and issues around control and order arise. Erotic Feelings: Emotions and sensations associated with sexual attraction and desire. Psychosexual Development: A Freudian concept describing how personality develops through stages centered on erogenous zones.