Comparative

Nyaya Fallacies Mapped to Western Logic

Comparative Logic & Fallacy Mapping

हिन्दी English

While both the Nyaya school of Indian philosophy and Western informal logic seek to identify defective arguments, they approach fallacies from different foundational angles. Nyaya Hetvabhasas focus primarily on epistemological defects—how a proposed reason (Hetu) fails its formal causal connection to a target property (Sadhya). Western informal fallacies often focus on dialectical and rhetorical errors—how premises manipulate language, distract from the core issue, or attack participants. This cross-cultural mapping links the classical 5 Nyaya Hetvabhasas (and their primary sub-types) to equivalent Western formal and informal fallacies.

The reason (Hetu) is too broad or erratic—it leads to both the presence and absence of the target property (Sadhya), failing to prove a unique connection.

Western equivalents

  • Hasty Generalization / False Cause (Post Hoc) — Informal Fallacy of Unrepresentative Generalization

    Maps closely to Sadharana Savyabhichara (too common). It asserts a universal connection based on a reason that occurs in unrelated or opposing situations.

  • Fallacy of the Undistributed Middle — Formal Syllogistic Fallacy

    In formal logic, sharing a common middle term without proper distribution fails to establish an exclusive link, directly mirroring Savyabhichara.

Comparative example

Nyaya: This hill has fire because it is knowable. (Defect: 'Knowability' applies to both fire and lakes.)

Western: Lions are mammals and dogs are mammals, therefore dogs are lions. (Defect: 'Mammal' is an undistributed middle term.)

The reason offered to prove a target property actually disproves it by establishing the exact opposite conclusion.

Western equivalents

  • Self-Defeating Argument / Internal Contradiction — Formal / Informal Fallacy of Inconsistency

    Direct 1:1 equivalent. The premises offered logically refute the conclusion the arguer is attempting to establish.

Comparative example

Nyaya: Sound is eternal because it is produced. (Defect: Being 'produced' inherently implies starting in time, proving impermanence.)

Western: There are absolute no universal truths. (Defect: The statement itself claims to be a universal truth, refuting its own assertion.)

An argument's reason is met with an equally valid counter-reason that establishes the opposite conclusion, creating an unresolved standoff.

Western equivalents

  • False Balance / Unresolved Dialectical Stalemate — Informal Fallacy of Relevance & Weight

    Occurs when two competing inferences carry equal apparent weight without an independent tie-breaker (Pramana) to resolve which reason dominates.

Comparative example

Nyaya: Arguer A: 'Sound is eternal because it is audible.' Arguer B: 'Sound is non-eternal because it is produced.'

Western: Expert A: 'Policy X reduces inflation based on Model 1.' Expert B: 'Policy X increases inflation based on Model 2.' (Without evaluating model validity, the debate is counterbalanced.)

The reason offered relies on an unproven, non-existent, or false premise (Paksha or Hetu), rendering the whole argument ungrounded.

Western equivalents

  • Begging the Question (Petitio Principii) / Circular Reasoning — Informal Fallacy of Presumption

    Maps to Vyapyatvasiddha—assuming the relation between premise and conclusion without proving it first.

  • False Premise / Reification Fallacy — Informal Fallacy of Material Premise

    Maps to Ashrayasiddha—basing an argument on a fictitious or unproven subject entity (e.g., arguing about the physical properties of ghosts).

Comparative example

Nyaya: The sky-lotus is fragrant because it is a lotus. (Defect: 'Sky-lotus' does not exist.)

Western: Paranormal activity causes electronic glitches in this house because ghosts interfere with wiring. (Defect: Assumes the existence of ghosts as a premise.)

The conclusion reached by inference is directly contradicted and overruled by direct empirical perception (Pratyaksha) or stronger primary evidence.

Western equivalents

  • Empirical Refutation / Denial of Fact — Informal Fallacy of Empirical Violation

    Directly equivalent. Inference cannot override direct, repeatable sensory evidence.

Comparative example

Nyaya: Fire is cold because it is a substance. (Defect: Direct touch proves fire is hot; inference is overruled by Pratyaksha.)

Western: This room is pitch black because all lights are off. (Defect: Observed directly while standing in a brightly sunlit room.)

Intentionally playing on ambiguous words, metaphors, or generalizations to derail an opponent's argument.

Western equivalents

  • Equivocation Fallacy — Informal Fallacy of Ambiguity

    Direct equivalent to Vak-chhala—exploiting homonyms or double meanings to distort the original claim.

  • Strawman Fallacy — Informal Rhetorical Fallacy

    Maps to Upachara-chhala—taking a figurative or specific statement literally to create a ridiculous version of the claim to attack.

Comparative example

Nyaya: Person A: 'That child has a new blanket (Nava-kambala).' Person B: 'No, he doesn't have nine (Nava) blankets, only one!' (Exploiting 'Nava' meaning both 'new' and 'nine').

Western: Person A: 'We need to manage our budget carefully.' Person B: 'So you're saying we should starve our employees?' (Distorting the claim into an extreme strawman).

Procedural and behavioral violations in debate—such as shifting goalposts, introducing irrelevant topics, or making personal attacks when cornered.

Western equivalents

  • Red Herring / Shifting Goalposts (Pratijnantara) — Informal Fallacy of Relevance

    Maps to Pratijnantara (changing the thesis midway) and Arthantara (introducing irrelevant topics to avoid losing).

  • Ad Hominem — Informal Rhetorical Fallacy

    Occurs when a debater abandons logical premises (Pratijna-sannyasa) and attacks the opponent personally to evade defeat.

Comparative example

Nyaya: When caught in a logical contradiction about taxes, shifting the topic to attack the opponent's personal character or changing the definition of tax.

Western: A debater losing an argument on environmental policy suddenly brings up the opponent's past marriage history (Ad Hominem / Red Herring).

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