Unit 3: Anumana and Vyapti

Anumana and Concomitance (Vyapti)

In the Tarkasamgraha, Anumana (Inference) is the second source of valid knowledge. It is defined as knowledge that follows other knowledge—specifically, the knowledge of a sign (Hetu) that leads to the knowledge of the thing signified (Sadhya).

Constituents of Anumana

• Sadhya: The major term or the thing to be proved (e.g., Fire).
• Hetu (or Linga): The middle term or the reason/sign (e.g., Smoke).
• Paksa: The minor term or the location where the Sadhya is to be proved (e.g., The Hill).

"Anumiti is the knowledge produced by the consideration of a sign (paramarsa). Anumana is the instrument of that knowledge."

Understanding Vyapti (Concomitance)

Vyapti is the logical ground of inference. It is the invariable, unconditional relation between the Hetu and the Sadhya. It ensures that wherever the Hetu (Smoke) is present, the Sadhya (Fire) must also be present.

Types of Vyapti

• Anvaya-vyapti: Positive concomitance—the presence of Hetu is followed by the presence of Sadhya (Wherever there is smoke, there is fire).
• Vyatireka-vyapti: Negative concomitance—the absence of Sadhya is followed by the absence of Hetu (Wherever there is no fire, there is no smoke).

Classification of Inference

Inference in Indian Logic is classified from multiple perspectives—psychological, causal, and logical.

1. Psychological Classification

2. Causal Classification (Based on the relationship between Cause and Effect)

• Purvavat: Inference of an unperceived effect from a perceived cause (e.g., Inferring rain from dark clouds).
• Sesavat: Inference of an unperceived cause from a perceived effect (e.g., Inferring rain occurred upstream from a muddy, rising river).
• Samanyatodrsta: Inference based on common observation rather than direct causal relation (e.g., Inferring the motion of the sun from its changing position in the sky).