>Concepts are mental activities that identify disparate concretes by ignoring some aspects of their differences. This is a good intuition for a certain set of

>Concepts are mental activities that identify disparate concretes by ignoring some aspects of their differences. This is a good intuition for a certain set of topological notions: http://en.wikipedia.org/wiki/Separation_axiom http://en.wikipedia.org/wiki/Separation_axiom