Differentiating is an act: distinguishing a reflexive relational unit from other such units.
Given that the coherence of the reflexive relational unit is determined by its differentiation from what is not itself, it cannot not derive a dynamic of determination: Differentiating. This is the act by which a reflexive relational unit distinguishes itself not only from non-relation but from other distinct reflexive relational units within the relational field.
The reflexive unit has folded its boundary into its relational activity — it relates to its own limits. But a boundary implies two sides. The unit has dealt with the inside; the outside may be populated by other units produced through the same derivation. Differentiating engages the outside.
Differentiating opens the derivation from the singular to the plural. Everything before this step concerned a single relational unit; from this step forward, the derivation concerns multiple units and the structures that hold them together.