Jagadīśa
अवच्छेदकत्वनिरुक्ति: (Avacchedakattvaniruktiḥ)
In this book, Jagadīśa offers commentary on the nature of vyāpti as mentioned by Raghunatha Śiromaṇī in his Didhīti. Jagadīśa talks about two kinds of vyāpakatva in great detail. In this context, Jagadīśa alludes to the concept of avacchedakata and explains these allaying all the possible questions that one could raise in this context.
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.
प्रामाण्यवाद: (Prāmāṇyavādaḥ)
The original text of Gaṅgeśa, called Tattvacintāmaṇi, has been commented on by both Raghunātha Śiromaṇi and Gadāhara Bhattācārya. If knowledge is gained through the ways of knowing, then the very nature of knowledge rests on the nature and veridicality of these recognised ways of knowing. An examination of the veridicality of the ways of knowing is known as pārāmānya. In this book, both Raghunātha and Jagadīśa offer a detailed analysis of the debate concerning the nature and veridicality of the very idea of pramāṇa.
शब्दशक्तिप्रकाशिका (Śabdaśaktiprakāśikā (Vol-1))
Śabdaśaktiprakāśikā is an important text written by Jagadīśa Tarkālaṃkāra containing an analysis of śabda pramāna following the Navya-Nyāya tradition. This work is a defence of many of the theses of Gaṅgeśa, the author of Tattvacintāmaṇi. In many places, the views of Bhatṛhari and Srīpatidatta, the author of Kalapa-pariśiṣta, have been critically assessed and defended. The author offers a detailed analysis of how the knowledge of the meaning of a sentence is generated through the presence of the elements like ākāṁṣkā, yogyatā and āsatti. Since the meaning of a word is defined in terms of śakti, a question arises with regard to the locus of śakti. Bhāṭṭa Mīmāṁsakas hold that śakti stays in the universal. Jagadīśa refutes this thesis of the Mīmāṁsakas. The author also refutes the thesis that the locus of śakti is the individual object, a view that is propagated by Raghunātha Śiromaṇi. Jagadīśa defends the view that combines both the insights that the locus of śakti is the individual object and the locus of śakti is the universal. In this book, Jagadīśa presents an analysis of the nature of lakṣanā. In this work we also find an analysis of how ākaṁkṣā, yogyatā and āsatti could be treated as the cause of understanding the meaning of a sentence. Jagadīśa, however, refutes the view that the knowledge of tātparya is the cause of understanding the meaning of a sentence, instead proposes the view that prakaraṇajñāna is the cause of understanding the meaning of a sentence. Thus in the present work the author, after defending śabdapramāṇa as an independent pramāṇa, offers his analysis of the ways of generating linguistic understanding.
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.
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.
सिद्धान्तलक्षणम् (Siddhānta Lakṣaṇam)
The final definition of vyāpti, known as siddhāntalakṣaṇa, has been explained by Jagadīśa in this work. The final definition of vyāpti is: where pratiyogyasāmānadhikaraṇya tāsāmānādhikaraṇatyantābhāvāpratiyogitāvacchedakabhacchinam does not hold, their vyāpti stays in the same locus. Raghunātha Śiromaṇi comments on this definition of vyāpti. Jagadīṣa further explains this final definition of vyāpti.