ध्ब्मसजन्यभावयो: कार्यकारणभावरहस्यम् (Dhvaṃsa- Janyabhāvayoḥ Kārya-Kāraṇabhāvarahasyam)

In this essay, Harirama Tarkavagisa undertakes an analysis of the nature of the causal relationship between a positive effect and destruction. The author examines the nature of the inference viz. Dhvaṃsa is due to vināśa. If one takes into consideration this inference, there must be a hetu here and the hetu could be said to have an upadhi viz. Bhāvatva. Harirama, in this context, presents different ways of formulating the causal relation. The author ends this essay by concluding that the positive effect (janyabhāva) could be said to be the cause of destruction (dhvaṃsa) through the relation of pratiyogitva.

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-3))

The third volume of Śabdaśaktiprakāśikā contains an analysis of samāsa. The book starts with a presentation and analysis of the definition of samāsa in general. Jagadīśa distinguishes nitya samāsa from anitya samāsa. The present work contains an analysis of six kinds of samāsa, viz, 1. Dvigu, 2. Tatpuruṣa, 3. Avyaībhāva, 4. Bahubrīhi, 5. Dvandva. The author accepts another samāsa viz. Upapada. The Grammarians hold that the vigraha vākya and the samasta vākya do not have the same śakti and so the nature of understanding the meaning of the vigraha vākya does not amount to understanding the meaning of the samāsa. Jagadīśa refutes this view of the Grammarian and argues that both the vigraha vākya and the samāsa do possess the same meaning. While the traditional Pāṇinian grammar includes karmadhārāya samāsa in tatpuruṣa samāsa and dvigu samāsa in karmadhāraya samāsa, the Katantra Grammar includes dvigu samāsa in tatpuruṣa samāsa. Jagadīśa intervenes in this debate and holds that karmadhāraya and dvigu are independent samāsas and so he thinks that there are six kinds of samāsas viz. tatpuruṣa, avyaībhāva, bahubrīhi, dvandva, karmadhārāya and dvigu. In this book one finds a detailed analysis of all these six kinds of samāsa. Even if Jagadīśa does not accept upapada samāsa as an independent samāsa, still he offers an analysis of upapada samāsa on behalf of those who accept upapada samāsa.

Gadādhara’s Theory of Objectivity Viṣayatāvāda (Part-Two)

In this book, Sibajiban Bhattacharyya offers a detailed analysis of the text called Viṣayatāvāda, written by Gadādhara. After explaining the traditional Navya-Nyāya theory of objectivity, the author presents the later Navya-Nyāya theory of objecthood where it has been argued that objecthood cannot be cognition itself. Gadādhara’s theory of relation has been analyzed in terms of objecthood of qualified cognition. A detailed analysis of the ideas of qualificandness, qualificandumness, predicatehood could be found in this book.

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.

जागदीशीव्याधिकरणम् (Jāgadīśvyādhikaraṇam)

This is a prakaraṇa text on the Nyāya theory of vyāpti written by Jagadīśa. The main theme of the work centres around the nature of vyāpti.Knowledge of vyāpti is the cause of inferential knowledge. If the definition of vyāpti is constructed in terms of avyābhicāritatva, then one could explain  avyābhicāritatva in five alternative ways. And none of these alternatives is acceptable, for this understanding of vyāpti would fail to account for kevalānvayi inference. In order to remove this problem, the definition of vyāpti is reconstructed as pratiyogivṛttidharmāvacchinna-pratiyogitākabhāvarupa vyādhikaraṇadharmāvacchinnabhāva. Jagadīśa examines this new definition of vyāpti and offers his justification, refuting all the possible objections.