Āstika and nāstika are concepts that have been used to classify Indian philosophies by modern scholars, as well as some Hindu, Buddhist and Jain texts. The various definitions for āstika and nāstika philosophies have been disputed since ancient times, and there is no consensus. In current Indian languages like Telugu, Hindi and Bengali, āstika and its derivatives usually mean 'theist', and nāstika and its derivatives denote an 'atheist'; however, the two terms in ancient- and medieval-era Sanskrit literature do not refer to 'theism' or 'atheism'.
IAST (Devanagari: पाणिनि, paːɳin̪i) was a Sanskrit philologist, grammarian, and revered scholar in ancient India, variously dated between the 6th and 4th century BCE. Since the discovery and publication of his work Aṣṭādhyāyī by European scholars in the nineteenth century, Pāṇini has been considered the "first descriptive linguist", and even labelled as “the father of linguistics”. His approach to grammar was influential on such foundational linguists as Ferdinand de Saussure and Leonard Bloomfield.
The development of Indian logic dates back to the anviksiki of Medhatithi Gautama (c. 6th century BCE); the Sanskrit grammar rules of Pāṇini (c. 5th century BCE); the Vaisheshika school's analysis of atomism (c. 6th century BCE to 2nd century BCE); the analysis of inference by Gotama (c. 6th century BC to 2nd century CE), founder of the Nyaya school of Hindu philosophy; and the tetralemma of Nagarjuna (c. 2nd century CE). Indian logic stands as one of the three original traditions of logic, alongside the Greek and the Chinese logic.
(गुण) is a concept in Hinduism and Sikhism, which can be translated as "quality, peculiarity, attribute, property". The concept is originally notable as a feature of Samkhya philosophy. The guṇas are now a key concept in nearly all schools of Hindu philosophy. There are three guṇas, according to this worldview, that have always been and continue to be present in all things and beings in the world. These three guṇas are called: (goodness, calmness, harmonious), (passion, activity, movement), and (ignorance, inertia, laziness).
In Hinduism, Brahman (ब्रह्मन्) connotes the highest universal principle, the ultimate reality in the universe. In major schools of Hindu philosophy, it is the immaterial, efficient, formal and final cause of all that exists. It is the pervasive, infinite, eternal truth, consciousness and bliss which does not change, yet is the cause of all changes. Brahman as a metaphysical concept refers to the single binding unity behind diversity in all that exists in the universe.
Dignāga (also known as Diṅnāga, 480-540 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.
The Rigveda or Rig Veda (ऋग्वेद , from "praise" and "knowledge") is an ancient Indian collection of Vedic Sanskrit hymns (sūktas). It is one of the four sacred canonical Hindu texts (śruti) known as the Vedas. Only one Shakha of the many survive today, namely the Śakalya Shakha. Much of the contents contained in the remaining Shakhas are now lost or are not available in the public forum. The Rigveda is the oldest known Vedic Sanskrit text. Its early layers are among the oldest extant texts in any Indo-European language.
Udayana, (Devanagari: उदयन) also known as Udayanācārya (Udyanacharya, or Master Udayana), (circa 975 - 1050 CE) was an Indian philosopher and logician of the tenth century of the Nyaya school who attempted to devise a rational theology to prove the existence of God using logic and counter the attack on the existence of God at the hands of Buddhist philosophers such as Dharmakīrti, Jñānaśrī and against the Indian school of materialism (Chārvaka). He is considered to be the most important philosopher of the Nyāya tradition.
(bɦɐʈʈɪˈkaːʋjɐ; "Bhatti's Poem") is a Sanskrit-language poem dating from the 7th century CE, in the formal genre of "great poem" (mahākāvya). It focuses on two deeply rooted Sanskrit traditions, the Ramayana and Panini's grammar, while incorporating numerous other traditions, in a rich mix of science and art, poetically retelling the adventures of Rama and a compendium of examples of grammar and rhetoric. As literature, it is often considered to stand comparison with the best of Sanskrit poetry.
Upamāṇa (Sanskrit: "comparison"), upamana in Hinduism, is a pramāṇa, or means of having knowledge of something. Observance of similarities provides knowledge of the relationship between the two. It also means getting the knowledge of an unknown thing by comparing it with a known thing. For example, assume a situation where a man has not seen a gavaya or a wild cow and doesn't know what it is. A forester told him that a wild cow is an animal like a country cow but she is more furious and has big horn in her forehead.
