Essentialism is logically equivalent to necessary-and-sufficient condition structure.

Evidence

The subtitle of one article—“In defense of Aristotelian essentialism”—suggests that she is using a standard approach to concepts, the mathematical logic of necessary and sufficient conditions. An intimate bond links the necessary and sufficient condition structure to essentialism. If some characteristic is essential to be a human being, then that characteristic is a necessary condition for being human. — Gary Goertz, Social Science Concepts and Measurement, 210

Categorization

• DEFINE: Explains the tight conceptual bond: anything essential to a category is by definition a necessary condition for membership in it.
• XREF: Connects to Sartori-style classical concept analysis and the necessary/sufficient framework for defining concepts generally.