The inverse intension-extension relation holds only for necessary-and-sufficient concepts

Evidence

For example, the well-known claim that extension is inversely related to intension holds in general only for necessary and sufficient condition concepts. For family resemblance concepts the relationship can go in the other direction. — Gary Goertz, Social Science Concepts, 610

Categorization

• DEEPTHINKING: It guts a maxim repeated across methodology and information-retrieval literature by showing it is structure-dependent, not a law of concepts.
• XREF: Connects to the book’s earlier claim that family resemblance concepts lack necessary conditions, and to prototype and fuzzy-set measurement debates.