Another work by this man claims that its subject is an irreducible simple property that must be experienced to be known just as the one must see to understand the color (*) yellow.
One work by this man argued that physical facts do not always have to arise from mental facts and opens with a list of "truisms". This philosopher outlined three qualities of acceptable proofs in an essay that claims that valid knowledge is not always logically sound. Another work by this man claims that its subject is an irreducible simple property that must be experienced to be known just as the one must see to understand the color (*) yellow. This author of "A Defence of Common Sense" formulated the "here is a hand" argument to prove the existence of an external world. This man also defined the naturalistic fallacy and argued that the definition of good remains an "open question". For 10 points, name this American philosopher who wrote Principia Ethica.
One work by this man argued that physical facts do not always have to arise from mental facts and opens with a list of "truisms".
G.E. Moore [or George Edward Moore; or "Bill" Moore from family and friends]