The Catuṣkoṭi or Tetralemma
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The tetralemma or catuṣkoṭi constitutes a form of argument frequently encountered in Nāgārjuna’s works. It usually consists of the rejection of all of the following: a thesis, its negation, the conjunction of the thesis and the negation, the disjunction of the
thesis and its negation. The chapter discusses two forms of the tetralemma, a restricted one in which only two alternatives are rejected, and a full form in which all four are rejected. The remainder of the chapter discusses two crucial problem arising in
connection with the tetralemma: the problem of the distinctness of the four alternatives and the problem of the status of the third
‘contradictory’ alternative. The chapter also considers the positive variant of the tetralemma; in this all four alternatives are affirmed rather than rejected.
Keywords: catuṣkoṭi, tetralemma, logic, four alternatives, law of the excluded middle, negation
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