Vaiśeṣika: Ancient Indian Philosophy's Systematic Atomism and Categorical Realism

Vaiśeṣika is one of six classical Indian philosophical schools (darśanas) that developed a systematic metaphysical system centered on atomism and categorical analysis. Founded by Kaṇāda Kashyapa (6th-2nd century BCE) and elaborated in the Vaiśeṣika Sūtra, this school posits that reality consists of indivisible atoms (paramāṇu) that combine under moral principles like karma. The system classifies all entities into seven categories (padārthas) including substance, quality, motion, universals, particularity, inherence, and non-existence. Later commentators like Praśastapāda (5th century CE) integrated it with Nyāya logic. Vaiśeṣika presents striking parallels with Aristotle's Categories while maintaining distinct features like its treatment of absence (abhāva) as a real category. The school's realist epistemology and systematic ontology continue to interest contemporary analytic philosophy for their treatment of negation and metaphysical structure.