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...>[[Causal theory of reference]]<br />[[Semantic externalism]]<br />[[Brain in a vat]]{{·}} [[Twin Earth]]<br />[[Philosophical realism|Internal realism]] ..., and [[philosophy of science]].<ref name="CR">Casati R., "Hillary Putnam" in ''Enciclopedia Garzanti della Filosofia'', ed. [[Gianni Vattimo]]. 2004. Ga ...

...: A solution (in pink) to Apollonius' problem. The given circles are shown in black.]] ...p;2) and each solution circle encloses or excludes the three given circles in a different way. ...