This paper fixes closure as structural fixation within a non-modal structural system. Closure is not introduced as completion, termination, or end. It is not defined as sealing, containment, or finalization. Instead, closure designates a condition in which fixation is established. Retention is not annulled. Connections and configurations are not removed. They are fixed. A configuration holds as fixed without transition, continuation, or extension. No process is described, and no completion is assumed. Closure does not mark the end of a process. It does not indicate fulfillment or totality. It fixes a structural condition in which fixation holds. No subject is introduced. No interpretation is assumed. No causality is invoked. This paper fixes closure as the structural condition under which fixation is established.
Juza Minamikata (Fri,) studied this question.