Question: How many books are in the text composed by the founder Nyaya school of Hindu philosophy and is used in the development of Indian logic?

 The date when the text was composed, and the biography of its author is unknown, but variously estimated between 6th-century BCE and 2nd-century CE.  The text may have been composed by more than one author, over a period of time. The Nyāya Sūtras is an ancient Indian Sanskrit text composed by Akṣapāda Gautama , and the foundational text of the Nyaya school of Hindu philosophy.  The text consists of five books, with two chapters in each book, with a cumulative total of 528 aphoristic sutras, about rules of reason, logic, epistemology and metaphysics. <SEP>  Indian logic stands as one of the three original traditions of logic, alongside the Greek and the Chinese logic.  The Indian tradition continued to develop through to early modern times, in the form of the Navya-Nyāya school of logic. The development of Indian logic dates back to the "anviksiki" of Medhatithi Gautama (c. 7th century BCE) the Sanskrit grammar rules of Pāṇini (c. 5th century BCE); the Vaisheshika school's analysis of atomism (c. 2nd century BCE); the analysis of inference by Gotama (c. 2nd century), founder of the Nyaya school of Hindu philosophy; and the tetralemma of Nagarjuna (c. 2nd century CE). <SEP> Nabadwip ( ) is a city under Municipal administration in the district of Nadia in West Bengal, (India).  It is seated on the western bank of the Bhagirathi river.  The Bhagirathi river originally flowed down the west of Nabadwip in the past, forming a natural boundary between the districts of Bardhaman and Nadia.  With time it has shifted its course to where it is at present, cutting the city off from the rest of the Nadia district.  It is considered to have been founded in 1063 AD, which served as the old capital of the Sena dynasty.  It was a center of learning and philosophy in medieval India and is still noted for its traditional Sanskrit schools.  The Navya Nyaya school of logic reached its peak with the efforts of some well known contemporary philosophers of Nabadwip.  The great Vaishnava saint, social reformer and an important figure of the Bhakti movement, Chaitanya Mahaprabhu (1486–1533) was born here, for whose sake, this place has turned into an important center of pilgrimage for the Vaishnavs world wide as well as the Hindoos in general.  Many devotees who adhere to the Gaudiya sect of Vaishnavism come to Nabadwip for pilgrimage on the auspicious occasion of the Birthday celebration of Shri Mahaprabhu on the Phalguni Purnima (i.e. on the Full moon day of the March every year), and for various festivals in relation to Leelas of Shri Mahaprabhu like Sri Nabadwip-mandala Parikrama and other festivities like Dol yatra, Ras purnima Gaura-purnima. <SEP> Dignāga (c. 480 – c. 540 CE) was an Indian Buddhist scholar and one of the Buddhist founders of Indian logic ("hetu vidyā").  Dignāga's work laid the groundwork for the development of deductive logic in India and created the first system of Buddhist logic and epistemology (Pramana).  According to Georges B Dreyfus, his philosophical school brought about an Indian "epistemological turn" and became the "standard formulation of Buddhist logic and epistemology in India and Tibet."  Dignāga's thought influenced later Buddhist philosophers like Dharmakirti and also Hindu thinkers of the Nyaya school.  Dignāga's epistemology accepted only "perception" (pratyaksa) and "inference" (anumāṇa) are valid instruments of knowledge.