The Natural Law of Reciprocity, is a negative, descriptive, juridical discipline

If we define philosophy (positive and literary) as the search for methods of decidability within a domain of preference,

And:

If we define truth (negative and descriptive) as the search for methods of decidability across all domains regardless of preference.

Then:

We find that positive or literary philosophy(fiction or philosophy) informs, suggests opportunities, and justifies preferences for the purpose of forming cooperation and alliances between individuals and groups.

We find that negative or juridical philosophy(truth or law) decides, states limits, and discounts preferences, for the purpose of resolving conflicts between individuals and groups.

The Natural Law of Reciprocity, is a negative, descriptive, juridical science, not a fictional literature.