Tripartite Definition of knowledge and Fourth Condition

Document Type : Original Research

Author
Abdollrasul Kashfi
Assistant Professor at Shiraz University, Shiraz, Iran
10.30497/prr.2012.1203
Abstract
In Teatetus, Plato defines knowledge as “true Justified belief ”. Known as tripartite definition (or analysis) of knowledge, by 1960s it was a dominant definition for knowledge. In 1963, American philosopher Edmund Gettier in short paper, accepting necessity of three parts, has presented us with two counterexamples to the claim that knowledge is completely justified true belief. Since that, it has given numerous answers to Gettier’s counterexamples. Some of these answers accept Gettier’s objection to sufficiency of three fold conditions, try to complete it by adding a fourth condition. This essay surveys and criticizes answers of this kind and shows that these efforts werenot successful by now and that Gettier’s objection is yet remained.
Keywords
Knowledge
tripartite definition(analysis) of knowledge
Edmund Gettier’s counterexamples
Audi,Robert (1998), Epistemology A Contemporary Introduction to The Theory of Knowledge Routledge, London, 1998.
Dancy, Jonathan (1989), An Introduction to Contemporary Epistemolog, New York: Basil Blackwell.
Dretske, Fred (1971), "Conclusive-Reasans", Australian Journal of philisophy.
Gettier, Edmund.L (1972) "Is Justified True Belief Knowledge?", Analysis 23 reprinted in: New Readings In Philosophical Analysis, ed. H. Feigl, W.Sellars and K.Lehrer (1972), New York: Appleton-century-crofts
Goldman, Alvin (1967), "A Causal Theory of Knowing", The Journal of philosophy Vol 64,12.
Harman, Gilbert (1973), Thought, Princton, PrinctonUniversity Press.
Lehrer, Keith (1992), Theory of Knowledge, London Routledge.
Lehrer, Keith and Paxson, Thomas (1981), " Knowledge Undefeated Justified True Belief ".in: Essays on Knowledge and Justification, eds. George pappas and Marshal Swain, Ithaca, NY, Cornell University press.
Pappas, George and Swain, Marshal (1978), " Some conclusive Reasons Against Conclusive Reasons, in: Essays on Knowledge and Justification, eds. George pappas and Marshal Swain, Ithaca, NY: Cornell university press.