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Trairūpya (Sanskrit; English: "the triple-character of inferential sign") is a conceptual tool of Buddhist logic. The Trairūpya, ‘three conditions’, is oft accredited to Dignaga (c 480-540 CE) though is now understood to have originated with his teacher Vasubandhu (fl. 4th c.) in the Vāda-vidhi, [1] post-reconstruction of this work by Frauwallner (1957).[2]

Trairūpya

Trairūpya is a logical argument that contains three constituents which a logical ‘sign’ or ‘mark’ (linga) must fulfill to be 'valid source of knowledge' (pramana):

  1. It should be present in the case or object under consideration, the ‘subject-locus' (pakṣa)
  2. It should be present in a ‘similar case’ or a homologue (sapakṣa)
  3. It should not be present in any ‘dissimilar case’ or heterologue (vipakṣa)

When a ‘sign’ or ‘mark’ (linga) is identified, there are three possibilities: the sign may be present in all, some, or none of the sapakṣas. Likewise, the sign may be present in all, some or none of the vipakṣas. To identify a sign, we have to assume that it is present in the pakṣa, however; that is the first condition is already satisfied. Combining these, Dignaga constructed his ‘Wheel of Reason’ (Sanskrit: Hetucakra).[3]

References

  1. ^ Anacker, Stefan (2005, rev.ed.). Seven Works of Vasubandhu: The Buddhist Psychological Doctor. Delhi, India: Motilal Banarsidass. (First published: 1984; Reprinted: 1986, 1994, 1998; Corrected: 2002; Revised: 2005), p.31
  2. ^ Frauwallner, Erich (1957). 'Vasubandhu's Vādavidhiḥ'. Wiener Zeitschrift für die Kunde Süd-und Ost-Asiens 1, 1957, 104ff.
  3. ^ Matilal, Bimal Krishna (author), Ganeri, Jonardon (editor) & (Tiwari, Heeraman)(1998). The Character of Logic in India. Albany, NY, USA: State University of New York Press. ISBN 0-7914-3739-6 (HC:acid free), p.7-8


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