 Since dialetheism is simply a claim about truth, it can play a role in any area—say in traditional or mainstream philosophy—where  truth is involved. Among such topics, a prominent one is the debate between  realists  and  anti-realists  (for example, idealists and constructivists) in metaphysics. Very roughly, to be a realist about entities of some kind is to maintain that such entities objectively exist apart from, and antecedently to, anyone’s thought of them; and, therefore, that our thoughts, beliefs and theories concerning such entities are made objectively true or objectively false by them, apart from what we think of them (more refined definitions of realism and anti-realism are certainly available; but this characterization will suffice for our purposes).