Gangesha Upadhyaya
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Gangesha Upadhyaya (or Gangeśa Upādhyāya) was a 13th century Indian mathematician and philosopher from the kingdom of Mithila. He established the Navya-Nyāya ("New Logic") school. His Tattvacintamani ("The Jewel of Thought on the Nature of Things") is the basic text for all later developments. The logicians of this school were primarily interested in defining their terms and concepts.