śabda
The Nyāya Theory of Knowledge
The present book is a detailed exposition of Nyāya epistemology. The book contains twenty chapters: 1. Introduction, 2. The nature and forms of knowledge, 3. Valid knowledge and its method, 4. The factors of valid knowledge, 5. The test of truth and error, 6. The definition of perception, 7. The psychology of perception, 8. Ordinary perception and its objects, 9. Three modes of ordinary perception, 10. Extraordinary perception, 11. The nature of inference, 12. The grounds of inference, 13. Classification and Logical forms of inference, 14. The fallacies of inference, 15. The nature and forms of upamāna, 16. Upamāna as an independent source of knowledge, 17. The nature and classification of śabda, 18. Of words, 19, Of sentences, 20. Other sources of knowledge. This book thus offers an analysis of the different pramāṇas accepted by Nyāya.
शब्दशक्तिप्रकाशिका (Śabdaśaktiprakāśikā (Part-1))
In this book Jagadīa Tarkālaṃkāra presents a detailed analysis of various aspects of śabdapramāṇa from the perspective of Navya-Nyāya. The book starts with a critical assessment of the views of Vaiśeṣika and Mīmāṃsaka philosophers with regard to the veridicality of śabda as a pramāṇa. This is followed by a discourse on the nature of meaningful words, the nature of prākṛti, pratya, nipāta. A definition of a sentence is formulated. The relation between word and meaning in its different aspects has been presented. The book ends with a discussion on the nature and different kinds of samāsa.
शब्दशक्तिप्रकाशिका (Śabdaśaktiprakāśikā (Vol-2))
In the second volume of Śabdaśaktiprakāśikā, Jagadīśa presents a detailed analysis of Prabhākara’s kāryānvitaśaktivāda and refutes this view. Jagadīśa defends the niravacchinna śaktivāda of the words like ākāśa etc. The view of Raghuntha Siromani with regard to the causal nexus of linguistic understanding has been refuted. Jagadisa offers an analysis of the nature of paribhāṣika śabda and argues that proper names given to individuals do not have śakti and they are to be treated as paribhāśaika śabda. Jagadīśa defends the view that śakti resides in all the three loci: the individual, the universal and the relation of samavāya that holds between an individual and the universal. Jagadīśa also refutes the Mīmāṃsaka view that the sentence has lakṣaṇā and the view of Ālaṃkārika regarding the vyāñjanā relation has been rejected. In this book, Jagadīśa offers a detailed analysis of different kinds of lakṣaṇā and in this context, one comes across a criticism of the Prabhākara thesis that the word having lakṣaṇā is not the cause of syntactic knowledge of the sentence. This book ends with an analysis of the nature of yogaruḍa śabda.