Navya-Nyāya

“There’s no key on the table.” Simple enough — until someone points out that a key is lying there, just not your key. Or that the key is under a book, which is on the table. Or that the key is in the table’s drawer. Ordinary language copes with this by context and goodwill. Philosophers arguing about the soul, God or the meaning of scripture could not rely on goodwill. From the 14th century the logicians of Mithilā and Bengal built a language in which such statements could be made exactly. It is called Navya-Nyāya, “New Nyāya.”

School view This page sets out Navya-Nyāya as its own practitioners understood it. Its metaphysics is that of classical Nyāya–Vaiśeṣika, explained on Nyāya & Vaiśeṣika; its theory of knowledge on How We Know. Here the focus is on the method.

From old Nyāya to new

The old Nyāya Sūtra was a manual of debate and a theory of what exists. Over a thousand years of argument with Buddhist logicians, Mīmāṃsakas and Advaitins, Naiyāyikas found that their definitions kept being picked apart — most brilliantly by the Advaitin Śrīharṣa in the 12th century, who used Nyāya’s own tools to argue that no definition could survive scrutiny. The answer was a new precision. Navya-Nyāya shifted attention from things to cognitions of things, and set out to describe the exact structure of every cognition.

1. c. 11th c.UdayanaOften treated as the bridge between old and new; his precision already points the way.
2. 14th c.Gaṅgeśa’s TattvacintāmaṇiGaṅgeśa Upādhyāya of Mithilā writes “The Wish-Jewel of Truth” in four books, one for each pramāṇa: perception, inference, comparison and testimony. The book on inference is the longest and most studied.
3. 15th c.The Mithilā schoolVardhamāna, Gaṅgeśa’s son, and Pakṣadhara Miśra comment on and extend the work.
4. c. 1500Raghunātha ŚiromaṇiIn Navadvīpa in Bengal, his Dīdhiti commentary and his short Padārthatattvanirūpaṇa boldly revise the old list of categories.
5. 16th–17th c.Mathurānātha, Jagadīśa, GadādharaThe Navadvīpa masters. Gadādhara Bhaṭṭācārya’s Vyutpattivāda and Śaktivāda analyse how words and sentences mean.
6. 17th c.Annambhaṭṭa’s TarkasaṅgrahaA short primer of the whole system, with the author’s own commentary, the Dīpikā. Still the first book a student of Nyāya reads.

Annambhaṭṭa’s primer opens, as Nyāya texts do, with a prayer — a reminder that for its authors this logic served a theistic, liberating philosophy:

Stories cluster around these scholars. A well-known tale says Mithilā would not let its students copy the Tattvacintāmaṇi, so Vāsudeva Sārvabhauma memorised it and wrote it out again in Navadvīpa; another has the young Raghunātha out-arguing his Mithilā teacher. Popular tradition They are hard to verify, but they capture a real rivalry between the two centres.

The world of these schools was narrow. Navya-Nyāya was taught almost entirely by and to Brahmin men, in households and ṭols (traditional schools) where women and lower castes had no place as students. That should be said plainly, even while admiring what was achieved there.

Every cognition has a shape

Take the cognition “there is a pot on the floor.” Navya-Nyāya restates it as: the floor is qualified by a pot, by the relation of contact. Every qualified cognition has three parts:

• the viśeṣya, the qualificand — what the cognition is about (the floor);
• the prakāra, the qualifier — what is said of it (the pot);
• the saṃsarga, the relation that ties them (contact).

Two more words name the ends of any relation. In “the pot is on the floor,” the pot is the pratiyogin, the “counter-positive” — the thing that is related — and the floor is the anuyogin, the locus to which it is related. Finally, the abstract suffix -tva or -tā (like English “-ness”) turns anything into a property: “pot-ness” (ghaṭatva), “being-the-locus” (adhikaraṇatā). With these few tools, any sentence can be rebuilt as a chain of loci and properties.

Taking a sentence apart

The central technical term is avacchedaka, “limiter” — the property or relation that fixes exactly how far a relation reaches. Watch it at work on the missing key. Step through:

Two classic examples show limiters working on the locus rather than the absentee:

Four kinds of absence

Because so much of the system turns on “not,” the kinds of abhāva must be kept apart. Annambhaṭṭa’s primer states them in one line:

Tap each, with a pot from the potter’s wheel:

• 1प्रागभावPrior absenceThe pot before it is made: absent in the clay, with no beginning, but it ends when the pot is made.
• 2ध्वंसDestructionThe pot after it is smashed: this absence begins with the hammer-blow and never ends. A smashed pot never returns.
• 3अत्यन्ताभावAbsolute absenceColour in the air, a pot on the floor where none ever stood: an absence with no beginning or end, by a given relation.
• 4अन्योन्याभावMutual absenceDifference: “the pot is not cloth.” Not something missing from a place, but one thing’s not being another. Its limiter is identity.

The first three are “relational” absences (saṃsargābhāva) — the absence of something in something. The fourth is the denial of identity. Mix them up and arguments collapse: “the pot is not on the floor” and “the pot is not the floor” are entirely different claims.

Defining pervasion

All inference rests on vyāpti, “pervasion,” the invariable link between the hetu (the reason, smoke) and the sādhya (what is to be proved, fire). The primer gives the textbook definition:

Gaṅgeśa’s problem was to make that “wherever” exact. His Tattvacintāmaṇi examines a series of trial definitions and rejects each. One says: the reason must not occur where the absence of the thing to be proved occurs — smoke is never found where fire is absent. Good for smoke and fire. But some inferences have a sādhya that is present everywhere — “this is nameable, because it is knowable.” Nothing lacks nameability, so “the place where nameability is absent” has no instance, and the definition goes empty. To capture every valid case and no invalid one, Gaṅgeśa had to specify the limiters of each absence and each relation — which is why the final definitions run to a single, very long compound. The point is not obscurity. It is to make a counter-example impossible.

Everyone’s language

Within two centuries Navya-Nyāya had become the working idiom of Sanskrit scholarship, as Latin scholasticism once was in Europe. Its reach is mapped on Navigating the Śāstras:

• Grammar. Later grammarians such as Kauṇḍa Bhaṭṭa and Nāgeśa argued with the logicians about how a sentence means, using the logicians’ own terms — and Gadādhara answered (see Vyākaraṇa).
• Mīmāṃsā. Khaṇḍadeva (17th century) recast ritual hermeneutics in the new style, sometimes called “new Mīmāṃsā” (see Mīmāṃsā).
• Vedānta. The greatest Vedānta debate of the age — the Dvaitin Vyāsatīrtha’s Nyāyāmṛta against the Advaitin Madhusūdana Sarasvatī’s Advaitasiddhi — was fought entirely in Navya-Nyāya terms (see Dvaita and Advaita).
• Law. Bengal’s Dharmaśāstra scholars, such as Raghunandana, wrote in its idiom; and the 18th-century Naiyāyika Jagannātha Tarkapañcānana compiled the digest of Hindu law that H. T. Colebrooke translated for the colonial courts (see Dharma Shastras).

To be a paṇḍita in early modern India was, almost by definition, to argue in this language. It is still taught in traditional schools in Varanasi, Navadvīpa, Tirupati and elsewhere, and the art of debate it served is explored on Vāda.

Is it “logic”?

When Western scholars met Navya-Nyāya in the 20th century, they reached for comparisons. Each is illuminating and each needs care. Modern reading

Check your knowledge:

Questions people often ask

Key terms on this page

Sources & further reading

• Daniel H. H. Ingalls, Materials for the Study of Navya-Nyāya Logic (Harvard Oriental Series 40, Harvard University Press, 1951).
• Bimal Krishna Matilal, The Navya-nyāya Doctrine of Negation (Harvard Oriental Series 46, Harvard University Press, 1968).
• Bimal Krishna Matilal, The Character of Logic in India (SUNY Press, 1998).
• Jonardon Ganeri, The Lost Age of Reason: Philosophy in Early Modern India 1450–1700 (Oxford University Press, 2011).
• Karl H. Potter and Sibajiban Bhattacharyya (eds), Encyclopedia of Indian Philosophies, Vol. 6: Indian Philosophical Analysis — Nyāya-Vaiśeṣika from Gaṅgeśa to Raghunātha Śiromaṇi (Princeton University Press / Motilal Banarsidass, 1993).
• Stephen H. Phillips and N. S. Ramanuja Tatacharya (trans.), Epistemology of Perception: Gaṅgeśa’s Tattvacintāmaṇi, the Perception Chapter (American Institute of Buddhist Studies, 2004).
• Gopinath Bhattacharya (trans.), Tarkasaṃgraha-dīpikā on Tarkasaṃgraha by Annambhaṭṭa (Progressive Publishers, 1976).
• Frits Staal, Universals: Studies in Indian Logic and Linguistics (University of Chicago Press, 1988).