 One idea is tied to the notion of conceptual or reductive analysis. When philosophers attempt to provide an analysis of some concept or notion, they often try to provide a reductive analysis of the notion in question, i.e. to analyze it in other terms. Applied to the philosophy of mind, this notion might be thought of entailing the idea that every mental concept or predicate is analyzed in terms of a physical concept or predicate. A formulation of this idea is (9):