Nigamana

Nigamana (निगमन) means “conclusion” or “thesis restated.” It is the fifth and final member of the Nyaya five-membered syllogism, restating the original thesis as established by the preceding four members.

Overview

The nigamana takes the form: “Therefore, this hill has fire.” It is a restatement of the pratijna (thesis) now supported by the hetu (reason), udaharana (example), and upanaya (application). The nigamana thus closes the argumentative circle, affirming the original claim with the accumulated weight of evidence.

Philosophical Context

The nigamana completes the pancha-avayava (five-membered syllogism) that is the hallmark of Nyaya logic. Its function is not merely repetition but affirmation: the thesis now carries the force of logical demonstration. The relationship between pratijna and nigamana is one of purvapaksha (prior position) and siddhanta (established conclusion). A valid nigamana must follow necessarily from the preceding members and must not introduce new premises.

Interpretations

Some logicians, including certain Buddhist and Jain thinkers, argue that the five-membered form is unnecessarily prolix and that the essential structure of inference is three-membered (reason, example, conclusion). The Navya-Nyaya school defends the five-membered form as pedagogically necessary for training in dialectics (vada). Comparison (upamāna), which Nyaya treats as an independent pramana rather than a form of inference, does not require the five-membered structure; the syllogism belongs to anumāna (inference) alone.

Verification Notes

• Nyayasutras 1.1.36 states the definition of nigamana.
• Structural analysis in Nyayamanjari of Jayanta Bhatta.
• Audited against Encyclopedia of Indian Philosophies (September 2026).