A public work truly exists when someone assumes responsibility for it.
The symbol ∈ marks that gesture of assumption.
A work ∈ when:
An autonomous agent ∈ when a public manifest exists declaring its identity, capabilities, limits, and the human chain of responsibility that backs it.
Without that declaration, the agent operates outside the field of legitimized public existence.
In mathematics, ∈ means belongs to. When we write x ∈ A, we say that element x belongs to set A — not that it possesses it, not that it created it, but that it is part of it.
Applied to public authorship: a work ∈ when it belongs to someone willing to stand behind it.
Institutions are not born from decrees. They are born from gestures that repeated until they became practices, practices that consolidated into norms.
Gesture → Practice → Norm → Institution
∈ is at the gesture stage. Repetition is what makes it an institution.
Every published work must be accompanied by an explicit act of assumed authorship. Without authorship there is no legitimacy.
Two sentences. No exceptions. This is the founding gesture.