Philosophers try to understand things. One traditional way that goes is to provide a definition. Q: What is knowledge? A: Something is knowledge if and only if it is justified true belief. K=JTB.
Attempts to give necessary and sufficient conditions in this way typically fail. JTB is insufficient, and a literature pops up suggesting some additional condition, so that K=JTB+X. Some later philosophers pass quickly over the difficulty, not bothering to fill in a value for X and suggesting that for their purposes we can just focus on the JTB part.
A popular alternative since the mid-1900s has been to analyze in terms of cluster concepts. When X, Y, and Z all seem relevant but none seem either necessary or sufficient, say instead that the concept is a cluster formed by those criteria. This has been a common move for analyzing art.1
Continue reading “Clusters without cluster concepts”