Padārtha refers to the concept of 'substance' or 'thing' in Indian philosophy, particularly within the Vaiśeṣika system. It encompasses all that exists, both physical and non-physical, and serves as a fundamental category for understanding reality. This term is crucial for discussing the atomic theory and pluralistic realism, causation, and the interrelation between Nyāya and Vaiśeṣika, as well as logic and reasoning.
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